Shadow of Tranquility (NarutoxHighschool-DXD)
Disclaimer: This story is fiction. All the characters, names and places belong to their respective owners.
What to do, what to do… oh yeah… damn friend wanted to know what happened next in the prologue, so I took some time to write this… This chapter will conclude the current arc so enjoy. It will be a while until next arc. ^^V
=[Prologue]=
Act II
High above the unchanging purple sky of the underworld, an angelic was flying at hypersonic speed, trailing shadows mist behind him. It would not have been possible for any angels – or devils – to move at such speed nor would they need to. They could simply teleport to wherever they wish, cutting out the travelled time.
"I'm still not fast enough," the blond boy muttered as twelve of his black wings extended backward with an unspoken command. They were producing enormous amount of thrust by projecting blacken solid substances behind. The boy's body was coated in a thin layer of the same substance in order to protect him from the shockwave that his impossible speed now produced. As abide with his wishes, all his wings glow eerily dark and expelled an even greater amount of the materials as his speed increased several fold.
Naruto couldn't teleport back to heaven anymore. He had fallen and so the heaven system had locked him out. He would need to find a weak point between dimensions and breakthrough that the old fashion way. He knew that the siege of heaven had already started, but he wanted to arrive there and protect the place that now was his home. There was another reason to be there as well. Lucifer, along with the rest of the Satans was leading the assault. The prospect of finally having his revenge was what really drove him forward. Besides killing the person who had destroyed his life and murdered his sister, he had nothing left to live for. He was so powerless, but not anymore as he could feel the darkness overwhelmed his senses. His entire being radiated with incredible energy.
Soon enough, Naruto found a weak spot and used his newly dark power to punch through the barrier, ripping the fabric of reality apart to create a rift. He immediately passed through. Heaven was burning as he had expected. Countless devils filled the sky as thousands of destructive blasts rained between the two battling factions. Naruto quickly threw the dark spear that was in his hand toward one of the devils in his path. Its trajectory was true as it pierced through the intended target. It continued onward, however, passing through several more, killing them and finally exploded amidst the unsuspecting mass. The resulting massive dark sphere of tainted energy engulfed several dozen others nearby; devil and angel alike was eradicated while more being flung away by the resulting shockwave.
Naruto's eyes widened at the devastation caused by a single spear. "Is that my power now?" the boy queried while devils and angels turned their attention at the new comer, seeing how their comrades had just been killed.
"What is a fallen angel doing here? Such destructive power! Is it Azazel?" Several of the angels called out, focusing on the twelve jet-black wings.
"No it's can't be, the Fallen had already dropped out of the war," one of the other angels said and materialized several light spears all around him. Naruto quickly glanced at them before realizing that his jet-black wings were unwelcome here. It was to be expected. The fallen were despised after all. His previous attack didn't help his case at all. In that single strike, the newly fallen angel had vaporized much of the devils in the vicinity along with several angels who was fighting them.
"I'm Naruto Uzumaki, where's Micheal? Is God safe?" Naruto called out as the angels looked at him and started whispering to each other. The surviving devils in the area began to retreat and regroup elsewhere.
"So you have fallen huh, we were wondering when you would. Micheal had given his essence – his very life force – to you so you could be resurrected as one of us. We let you joined our ranks and loved you as our own, but you… you desecrated it all by joining the Fallen."
"No, it's –
"I don't want to hear, a devil always will be a devil," one of them asserted with venom in his voice before throwing his spears at Naruto. He didn't bother letting the boy explained fully.
Several more angels did the same, following the first as the blond grabbed one of the airborne spear as it came close to him on reflex. It grew in size and turned pitch back as his new corruptive ability overtook it, rewriting its construct and strengthened it. There were many incoming deadly light flying toward him. Naruto quickly had his wings closed around him, protecting him from the incoming barrage. Light spears impacted against the fallen protective wings. Many explosions started all around him, producing multicolored light work initially. The light shifted rapidly and it became pure darkness afterward. Naruto's new shadow ability had protected him and devoured the light simultaneously. He didn't understand why, at least not yet then.
"Even the Fallen don't taint our light, what kind of abomination are you?"
"STOP THIS! I am not the enemy," Naruto beseeched desperately, but his requested was ignored as several of them started flying toward, and began their assault in close combat. The ex-archangel didn't want to fight them as he still considered them as his allies. All he could do was evading their relentless attacks. He flew around the sky of heaven while their city was burning below them.
"Hmm, why do you run? You could end them without any trouble," a voice in his head questioned, seemingly unsure the reason why. Naruto quickly remembered who this was. He really had merged with that entity, but it was too late now to regret his decision.
"I can't do that; they are my… friends," Naruto answered as he flew closer to the central spire of the capital, evading the light projectiles along the way. Micheal would have been there if there was no battle going on. The voice didn't say anything further as if it was thinking or trying to understand the human emotions of its host.
As the blond got closer to his intended destination, he saw someone that caused his blood to boil.
"LUCIFER!" Naruto roared in rage as he threw the dark spear from his hand. The spear flew through the air, spinning and trailing ominous sparks. It managed to pierce through the shoulder of its owner's archenemy. Lucifer was stunned at the speed and power behind the projectile. The powerful devil tried to pull it out with one hand but the spear refused to comply with his wishes. It even tried to seep through his skin, corroding his flesh with its dark power. Anyone can be consumed by darkness if given enough time.
"These devils are so strange," the voice in the blond head said almost childish as if it couldn't understand some the basic survival instincts. Naruto decided to ignore that for now. The angels that were chasing him quickly engaged the nearby devils as they were being attacked. Naruto was too quick for them; they couldn't keep up with him at all.
"What is this, how did you get this power?" Lucifer said while trying to stop the foreign power from invading his body. The only thing that sustained him now was his immersed demonic energy, but it was fighting a losing battle as it couldn't understand this invader at all. It was like a virus, trying to take control of his body. He brushed his silver back and looked directly at his former servant while a series of explosions nearby rocked the foundation of the capital. Those sounds were drowned when a huge one occurred, blinding most people.
An angel with twelve golden wings, battered and bruised, was sent across the city from the collapsing central tower. The building immediately enveloped in a spiraling black sphere before it dissipated, leaving littered remains. Lucifer took this chance and dashed forward. The Satan was able to pierce the boy's chest with his bare hand.
Naruto was distracted, worried about Michael in that instant. The limb of Lucifer went cleanly through his heart as he coughed up blood. His face was stunned due to his own recklessness. He was a seasoned warrior and he made the most stupid mistake, being distracted in a battle.
"SHIT!" Naruto cursed while raising his fist to the side. It was wrapped in flickering shadow like flames. He then unleashed a devastating punch against Lucifer's face. The power behind it was enough to shatter the Satan's jaw, bypassing his demonic defense and sent him across the burning city. The offending hand retrieved itself from the boy's chest. Blood started to spill out the opening. Naruto quickly covered the hole with one hand, trying to stop the bleeding.
"Darn it, I knew he was strong, I shouldn't have been distracted," Naruto scolded himself while his vision became hazy due to the blood loss. "Shit…"
"Don't you need that organ… was it a heart? In order to stay alive?" the voice asked, almost like a child, not sure if a heart was necessary or not. It obviously didn't have one and yet it was alive.
"Duh, but look like I'm missing one," Naruto retorted weakly, trying to make a joke in a bad situation. He couldn't believe that he was about to die… again.
"I see… do you want another one?" the voice asked as the blond blinked. Was the being within his very soul offering him another one? He wasn't sure. Before today, he didn't know it existed.
"You can do something like that?" Naruto questioned skeptically. There was no reply, but the blond was astonished as shadow filled the opening in his chest, and quickly regenerated his missing heart and sealed the hole. Naruto's strength returned as he stood up and jumped toward where Lucifer currently at, and to finish the job. He made a note to thank his… soul mate later.
The downed Satan quickly sent two dark beams at incoming blond with both able hands. Naruto wings covered him in haste as the potent beam crashed into him. The raw destructive energy was strong enough to push him back but Naruto held his ground through shear will. His feet, which were embedded into the concrete floor, also helped. Turning to his side while his wings protected him, he created another dark spear with one hand and threw it at Lucifer.
The Satan managed to dodge it. One spear embedded in him was enough as he promptly tried to fly away. His escape was blocked, for a twelve wings fallen seemingly teleported next to him. That was how fast the boy is with his new ability. The afterimage on the ground faded away.
"Impossible!" Lucifer's eyes widen, no one could move that fast, let alone in air.
"This is for my sister!" Naruto shouted as shadow covered his fist once again and embedded itself deep into Lucifer's gut. It didn't break through the flesh. It didn't need to. The Satan's devil's muscles were no match for the empowered fist just like when the fist had smashed against his jaw before.
Naruto continued his enraged assault across his sister's murderer's body. His relentless punches shattered bones, breaking muscles tissues apart through blunt force alone. Lucifer coughed out blood as he bowed over in excruciating pain. A hammer strike into the back of his head sent him crashing into city building below, smashing through all the floors with his body and slapping against the solid foundation on ground level. The impact sent fissure across the level, destroying support pillars and walls.
"Why do you not finish him off already?" the voice asked, wondering why its host was toying with someone who was much weaker than him. Just one blast would be enough.
"No, not yet, I want him to feel more pain! I want him to suffer as I have; I want to look in his face as I tore away all that he held dear. I want him to know that he was the cause of all of this! I am a monster of his own making," Naruto roared furiously and flew into the collapsing building. He sent Lucifer outside forcibly through the still standing wall with an enraged and devastating kick to the jaw. The wall wasn't standing anymore after that. It joined the rest of the support structure. Naruto walked out the building slowly toward the battered Satan as the building finally crumpled behind him.
"How does it feel to be so helpless now? This is how I feel when you took the only thing that matter away from me! Have a taste of my pain!" Naruto shouted as he stopped in front of the broken devil while shadows swirled all around him. Lucifer simply let out a chuckle. The man was seemingly unconcerned for his imminent death.
"Naruto… Naruto… You will forever be denied the chance of avenging your sister," Lucifer smirked as his demonic aura soared to new height instantly. It was at a dangerous level, and no devil would unleash that much unless…. Naruto's eyes widened as his wings hurriedly covered himself. Shadow also coated its surface, fortifying its defensive power greatly. A titanic explosion occurred, enclosed both of them and the surrounding. It grew in size before spitting out the ball of black feathers across the battlefield, and through several buildings.
"LUCIFER! Damn it all… my revenge…" Naruto shouted in anguish. The wall he had impacted finally managed to stop his momentum. Lucifer had committed suicide rather than allowed to be killed by Naruto. In that last moment, the devil had forever denied the boy what he sought for most. The orb within the boy soul wondered whether it mattered or not. Lucifer was dead, did it matter how he died?
Naruto fell forward and out fractured wall. He was on his knee. His wings opened wide, covered him in gloomy shadows. He looked at his hands as tears stream down his face. Even with his new bound powers, he couldn't have his revenge. He couldn't avenge his sister. It was now forever out of his reach.
"LUCIFER! I swear… I will hunt down all your kin, I will destroy your house, I will watch it burn for what you have done," Naruto vowed then that he would. If he couldn't kill the man who was responsible for all his suffering then he would end the man's line and make his children suffer. This was the promise and that promise Naruto would keep.
The blond flew up in the air and searched for a certain person. It was strange that they were at odd with each other when the war first started, being on different side and all. Now, near the end, the golden angel was his friend, probably his only true friend.
Michael who was leaning against a broken pillar as Naruto floated toward him and landed on the ground.
"Are you alright, Michael?" Naruto asked, kneeling beside his friend, looking over the angel's grevious wounds. The long blond-haired man with green eyes just chuckled after noticing the jet-black wings.
"Not really, you don't look well yourself, Naruto-kun," Michael tried to make a joke before frowning.
"God… is dead. He managed to kill Beelzebub and Asmodeus, but was critically wounded. That explosion before was due to Leviathan. The crazed woman self-destructed, killing him and I think fatally wounded me," Michael said as his breathing became heavier. Naruto told Michael that Lucifer was also no more while trying to figure out way to help the archangel.
"That makes all four then," was the archangel reply.
Gabriel, Uriel and Raphael were nowhere in sight. They were probably busy holding back the devil's assault. Even with all their leaders gone, there were still many powerful ultimate-class devils with great ambitions. On heaven side, Michael was the strongest of them all even after he gave up some of his essence, around a third, to Naruto. It was to grant the boy the power of a true archangel instead of an poorly imitated one. Naruto had never understood why Michael had helped him.
"I will give you back your essence, with it, you will have your original strength back and will survive this," Naruto said as Michael shook his head in refusal.
"No, Naruto, you will die. It cannot be extracted. The process will kill you. By some chance that you survive, you would lose your angelic powers, or what left of it now," Michael refused as Naruto looked away in shame. He had fallen, and likely corrupting Michael's essence within him. Still, there might be a chance.
"So that was it then, I thought something was out of place within you," the deep voice said as Naruto quickly asked what it had meant. It told him that Michael's essence was interfering with Naruto's new power because it was not part of him; it was alien object inhibiting his body like a large boulder in a river, disturbing the flow.
"But would I lose my angelic power if it was removed?" Naruto followed on while Michael pondered who Naruto was talking to. The voice remained silent. It wasn't sure what would happen if that essence was removed. Currently, Naruto's power was not fully utilized because of that foreign essence. The boy was strong, stronger than he'd ever been, but still weak in comparison to what a true Aspect could have been. The dark entity thought for a bit before replying.
"Do you have a choice?"
That answer was clear enough. Naruto needed to give back Michael's essence so the archangel could heal at his full potential. It should be enough to save his life. Since God was now dead, Michael was the only who could lead the host of heaven. The other Seraphs were unfit, especially Gabriel who was completely clueless about a lot of things, simple and common things. Without Michael, heaven would truly be lost and so will the glimmer hope in this dark world.
"Do it," Naruto ordered like a boss. The shadow orb complied nonetheless as Naruto moved toward Michael in an almost kissing fashion as Micheal's eyes widened in shock.
"What are you doing…" the straight angel said, wondering if his friend wanted him to fall as well, but there were better way than doing that. Besides, he wasn't into such thing.
"Stay still," Naruto interrupted the pure being's struggle. It was somewhat amusing as their lips almost touched. Just a bit more and they would perform the sinful act. Golden stream mist came out of Naruto mouth as the shadow was evicting it from his body. It sought out its original owner, and went into Michael's, rejoining the rest. Naruto stood up and felt a bit woozy.
"I will stop this battle, but I guess I'm no longer allowed to be here when this is over," Naruto said as his face went dark. He started to hold his chest in mild discomfort. The dreadful feeling only grew stronger, overwhelming his senses as shadow seeping across his body, crackling and forming jagged lines all over his skins. The feeling of rejection had gripped the boy's heart as the darkness swelled within him, growing with every passing moment.
"What are you doing!? You are allowing your own power to consume you!" the orb shouted loudly but the boy could no longer hear its voice. Shadow invaded his bright blue eyes, turning it pitch black as grim memories and nightmares infested his mind. Flashes of Sorrows, suffering, anguishes that had tormented him as Michael's purity was no longer holding it back. First was the destruction of his village by the youkai, manipulated via Lucifer's hand to meet his own end. The images of his parents using their bodies to shield him and his sister were so vivid. Their dying voices and his sister's cries rang in his head, vibrating through his body and stabbing his heart.
"Youkai…" Naruto growled as his face became feral. Nine tails fox was what given birth to all youkai as the book in his village had taught him. The image of the nine tail fox filled his mind as the shadow complied and erupted upward from it. It carried the source of its power along the rising pillar. It expanded, swirled around the boy, forming a titanic mythical beast. Its pitch-black eyes and massive onyx body grabbed every angels and devils' attention.
"Betrayed… Betrayers… BEGONE!" the colossal beast roared as winds sucked into its mouth rapidly forming a swirling ball of condense air. The beast roared once more, blasting the ball toward the stunned masses. The windy projectile expanded as soon as it left the beast's jaw. The growing ball of destruction shredded everything in its path and then exploded when it reached critical size, flattening the landscape.
"NARUTO!" Michael shouted, seeing his friend was lost in hatred. A swing of the beast tail was about to slammed into the archangel, but he evaded to the side. The massive black tendrils carved up the spot he was previously at. Several more tails swinging around, swatting devils and angels alike as if they were mere flies. The beast no longer recognized anyone.
"What is this thing!?" a devil asked, floating near another angel.
"It's like those blasted heavenly dragons," the angel stated. They remembered back when Ddraig and Albion, the two heavenly dragon fought each other with complete disregard for their own allies in the crossfire. That wasn't true, the dragons didn't have allies, and everyone was fair game in their constant brawl. They simply didn't care about anyone beside themselves. The angels and devils decided to get rid of this creature just like they did with the dragons. Their combined might can overwhelm anything, or so they thought.
The angels and devils started joined forces and attacked the beast after seeing how it was attacking both sides. The nine tail shadowy creature grunted as light spears and dark beams impacted against its massive body. Being huge just made it an easier target.
"DISAPPEAR!" It roared as shadow swirled across the blacken body before sending outward into the area at all directions. The wave of energy was strong enough to evict all its attackers, sending them tumbling away from the immediate vicinity. The fox began spamming dozens of condense ball of winds in all directions. Each of them was able to kill dozens of angels or devils at once regardless whether they were high level or not. Everything died and ripped apart if they were hit. Its nine extremely long tails swing left and right, flattening everything in sight, and continued slapping humanoid flies around.
"Michael, what is this thing?"
"Naruto… I don't know how, but he had gained power beyond even…" Michael stop what he was about to say. It was blasphemy to think anyone could have more power than God. He decided to gather his energy so it would heal his wounds more rapidly while retained a frown on his expression.
"I tried to stop him with reason, but he didn't seem to hear me at all," the strongest angel stated as his siblings floated around him, watching the devastation being unleashed.
"He's destroying what left of our home… we have to stop him…" one of the Seraphs said as Michael hesitantly nodded. The four guardians of heaven gathered up their powers and attacked the beast with their most powerful spell.
The beast grunt as it felt the impact. It quickly looked at its attacker as shadow continued streaming out of its eyes as if it remembered something. A flash, a memory had surfaced under all the anguish.
"EVEN YOU…" The beast roared in pain as nine of its tails detached from its rear. They wrapped around one end, forming a sphere and shrank in size and became nine dark ominous floating dense balls. The angels and devils wasn't sure what those balls was until all nine of them shot a beam out, piercing through everyone before swiping across the field, bisecting everything they touch. Hills, mountains collapsed.
Fears gripped everyone's heart at the monstrous power. The one that didn't get hit immediately attacked the beast in retaliation. One of the balls expanded into a flat sheet – a shield – and blocked the incoming attacks by covering its master body.
Every strike was absorbed into it, disappearing into the darkness, before thousands of dark spears emerged from the abyss that was the shield and sprayed at the masses. Countless dark spherical explosions covered the sky as angels, devils and their minions were erased from existence.
"Wow, I'm impress…" the dark orb complimented technique. It was totally unconcerned for the destruction that his host had unleashed. It didn't feel anything nor care to understand. It wasn't human so why should it. What it had desired most has been achieved. It had found a home as well as a companion. So what if its host destroy this place, there were plenty others. This was just one world among countless other.
Several balls fused together and formed flat helix sword. The weapon then butchered the ants at its master's wrath. Angels and devils counterattacks become ragged as they tried their best to dodge those fatal strikes. Their armies were slaughtered before something they could not understand. They no longer wish to fight each other anymore, only to survive this ordeal. Several ultimate devils had retreated from the battle field, trying to save what left of their underlings. Only the fearless or insane ones still remained, fighting alongside with the angels.
Eventually, the enormous dark power that was unleashed attracted the white orb as it floated toward the beast. The floating helix blades tried to cut that down but it was useless. Any darkness touched the orb changed into light before they shattered in glowing glitter and dissipated. The angels saw this was a sign of their God's returning. How they had hoped.
The white orb phased through the blacken body of the fox as it tried to rip out the invader with its claws recklessly. Unfortunately, its shadow body healed almost instantly so it could never reach deep enough.
"What are you doing brother?" the white orb asked, floating near the unconscious blond in the endless darkness. It was trying to talk to its sibling.
"Huh? Nothing… it's not me, this boy, Naruto, no longer hear my voice anymore. His heart now consumed by darkness… it's too bad really," the black orb replied monotonically. The white orb floated around and sunk into the boy's physical body. Moment later, it returned back outside.
"Not entirely, a single bit still remained… no longer existed in this mortal realm…but…" the white orb mumbled as the black orb wondered what its sister had meant.
"Nnnn… I like this world, this realm, so don't wreck it. I can bring her back, but it will take a while… she has been dead for a long time… reversing the cycle and resurrecting that particular soul will not be easy," the white orb stated and told its brother its plan to bring back the light and returned the boy's gentle heart. It would give him a future he could look forward to. Right now, Naruto despised the world; his hatred was controlling his mind and his power ran rampage.
"His sister? I don't know who that is, but okay, I will teleport him somewhere, but his rage is fueling his powers, it will only continue to grow stronger," the shadow orb said while the white orb escaped the shadowy artificial body of a beast. Darkness quickly swirled around the beast and beamed into the sky, carrying its master as it punched through the dimension and returned back to the human world. All the angels let out a held in breath, watching the orb of light floating away and disappeared.
"Was that God? Did he help us even after… you know…" one of the angels asked hopefully.
"I don't know… I hope it was… this war is over, we have lost much of our brethrens and so did the other side. I think a truce now would be acceptable," Michael said, floating toward their capital, or what was left of it. There wasn't a single building still standing.
The remaining devils had returned back to their realm. The Great War had come to an end. It didn't take countless of their own kind's lives, as well as their leaders to end the war. A common enemy did that. History would distort the fact to the real reason why the war had ended. A few would remember what had happened on that day. They would remember about a blond who spent his entire life, fighting for a war he didn't want, only to be betrayed by both sides in the end. His name would be forgotten in the years to come, but he would return to remind them the past was not forgotten.
XxXxX
An astronomer was star gazing and trotting down some calculation in his note. He had noticed some stars had disappeared from night sky. He looked into his telescope at some region in the heaven where they were before, but nothing was there, just empty spot now. A dark shadows crept across his telescope as he blinked on reflex, trying to see what it was.
"What is that?" the astronomer muttered to himself, rubbing his telescope lenses. It wasn't there anymore.
"Must be a smug… still I'm sure there were stars there, they couldn't just disappear, could they?" the man asked himself.
Far from earth, a shadowy cloud floated through the void of space. For millennia it had traveled across many worlds, only destroying them in its rage. It was still filled with hatred and malice as its tendrils extend outward and collided into the nearby star, devouring the light before wrapping around it and turned it into a singularity. Within the depth of misty darkness, a being roared, but his anguish weren't heard by anything.
The dark presence in his heart stirred as the white one had finally returned back into the physical world, the mortal realm.
"Naruto… I have a surprise for you, but we are a bit out of Earth right now, it will take around 15 of your birth world revolutions around the sun for you to get back," the dark orb stated. Its host was filled with anger, hatred for all things. Every world they came across, he destroyed, turning the planetary body into floating asteroid field with his immersed, and now, fully controlled power.
The dark aspect had complied with its sister's wishes to spare Earth from destruction. It was one of the handfuls of planet that had life in this galaxy. But the boy's rage was unquenchable and needed somewhere else to vent out all that anger. He couldn't use the Red Aspect's home so he decided to teleport the boy far from that world and from its accompanying dimensions of heaven and underworld.
"I hate that place… nothing but pain and suffering… Everyone betrayed me… I don't even know why I'm still alive… I just want it all to end…" Naruto shouted furiously. He was floating in space with twelve of his black wings was on his back. They weren't real angelic wings. The blond had lost those when he gave back the angelic essence. They were shadowy artificial wings; mimic to take a fallen's appearance.
"Not even your sister?" the orb asked, forcing Naruto to open his eyes. His anger diminished instantly.
"Kurama… you don't mean…"
"Yes, she has been resurrected. Who… I don't know, but I can feel her presence had returned back to the moral realm. Only my sister has the power to transcend life and death, to bring back what have passed through to the other side," Kurama stated. It had a name now. It'd told Naruto about how the white orb, Serene, would try to resurrect a precious soul so the blond would stop destroying planets in rage. A little hope had returned his sense then, but it wasn't enough.
"Imouto…" Naruto muttered as his wings opened wide. He blasted out of the shadow mist and quickly travelled toward Earth at teleportation speed. What some space faring race would call warp speed, faster than light. They were really far from their destination so it would take years to return, even with their powers. There was no such thing as instant travel, only moving absurdly fast through space to the point that it seemed like teleportation. Regardless the required travelled time, the maelstrom was returning home.
Author Note:
Naruto's power is beyond measureable in this. He can crush planets into nothing and destroy stars at his full powers. He can rip dimensions apart as well. Devils, Angels, Gods (not God, Loki etc)'s ability is below an Aspect power. Only an Aspect can truly fight another Aspect. Naruto's stats? Strength, Speed, Power is immeasurable so let's just leave it at that. This story isn't about Naruto's growth in power.
Like the story title implied, this is a shadow (Naruto) seeking tranquility, which mean serenity (Koneko) to calm his heart. Too bad Koneko don't remember anything right now as Serene (white orb) is snoozing away; piercing and bring back a long dead soul from the other side takes a lot of power after all. See you next chapter, which will start in Rias' time. Koneko is fifteen I think… or maybe 16?