The Guardian of Eden.

A/N: My attempt at a Highschool DxD crossover with Naruto! It's unfortunate but the stories I'm following don't get updated at a frequent enough interval. I only, truly,like few stories and those stories don't get updated often enough. Anyways, somewhat of a cliché start for you guys!

Well, idk, anyways tags are as follow:

NarutoXHarem, OP!Naruto, OOCNaruto,

Summary: She had seen his face for the briefest of seconds. Eyes as clear as the blue skies that reflected pain and sorrow deeper than the ocean. There was no mistake about it, if she didn't hurry to him, he would die. NarutoXHarem, OP!Naruto, OOCNaruto,

"Speech"

'thought'

"Techniques/Magic: in use"

'Other Worldly Being/Summon thought'

"Other Worldly Being/Summon speech"

Disclaimer: I don't own the characters that belong to Naruto and HighSchoolDxD neither the cover image... so... yeah.

Chapter One:

Seedling

A young red-headed girl cautiously crept through the thin forestry of the Gremory training grounds as she made way towards her intended destination.

Rias knew she shouldn't have been out her all alone. But curiosity was a damn near powerful thing to a child. She was close; her senses were tingling from an unseen force of power she assumed to be the source of her curiosity.

It had all started an hour ago…

Flash Back

One Hour Ago

Grayfia had left the study room when she heard her husband and king was acting like the immature child he was. She announced that Rias were to take a quick break until she returned.

Rias gleefully accepted the change of events and promptly plopped unto her bed while reaching for a manga. Her obsession with Japan was reaching an all-time high, especially with all the-

Rumble rumble.

"What is that!?" Rias cried out as the quaking intensified. She shakily got up to her feet and ranto her window overlooking the very large property estate of the Gremory. From her room's view, she could see miles upon miles; such was the advantage of living up in one of the towers. The scarlet haired child scanned the fields looking for any sign of the disturbance that was quickly getting more intense.

Fear started to grow in the pit of her stomach when she saw him.

A boy, perhaps, she couldn't really tell, encased in a golden shroud- maybe from the friction, again, she couldn't tell- zoomed past her from above, only a few feet away from her face before the figure continued its course towards the fields of the Gremory property.

Rias gasped.

Pain.

She had seen his face for the briefest of seconds. Eyes as clear as the blue skies that reflected pain and sorrow deeper than the ocean. There was no mistake about it, if she didn't hurry to him, he would die.

She pursed her tiny lips before making a decision. She summoned her familiar and in a puff of smoke came out a bat-like creature.

"Can you take me down?"

The bat eagerly nodded, shaking its entire body as a result. Using its clawed and pincer-like feet, it latched itself unto Rias' shoulder and beat its wing rapidly to pick up the extra weight.

As soon as they were out the window, Rias cried out in alarm as the bat-like familiar began a rapid descent almost immediately. She closed her eyes as she felt the wind blow past her. She hadn't begun her aerial training. Thus the high heights without standing on solid support or foundation left her feeling a bit queasy and nauseous. This, coupled with the anxiety of falling to her death forced the Gremory to close her eyes.

Her fear seemed unfounded as she opened her eyes a minute later, already a few feet above ground, she motioned for her familiar to drop her and the bat-like summon was glad to do so if the tired panting was anything to go by.

She landed lightly and caught her familiar in a comforting cradle. She petted it soothingly and murmered a quick "thank you" and dismissed it as a red glyph took it away.

She idly wondered if her familiar went back to the forest it came back or to another dimension. She decided she would ask her brother when she got the chance to. For now she-

Her eyes widened.

'Oh crap! I completely forgot about the person!'

She began a sprint towards the area with smoke rising above.

The Guardian of Eden

Nearing the edge of the thin forest, she reached a bush that would finally allow her to see what had engrossed her curiosity. Grabbing the bush to pull herself through, Rias felt a hint of anxiety and a ton of adrenaline coursing through her body.

Fingers trembling, Rias took a deep breath, hoping that a fresh set of oxygen could placate her nerves. Much like the time she spent descending from her room in the tower, the scarlet haired girl closed her eyes and hoped for the best.

She pushed through.

Immediately, as if that passing the bush triggered something, a wave of unrelenting force bore down on the young child. Almost instantaneously, she saw two figures she immediately recognized as her brother and his queen.

"Rias, are you okay?" He said softly.

The pressure that bore down on the child was suddenly lifted. Finding herself unable to speak, she simply nodded in response. Sirzechs glanced at his queen, whom quickly received the unspoken message.

The gray-haired beauty gathered Rias' form and quickly began a retreat to the Gremory estates.

Sirzechs let out a slight pant as he released the barrier he had formed that allowed his dear little sister to be mobile once more. Despite his calm and relaxed façade around his sister, he was internally struggling to keep up such a farce. The amount of energy that was expelled from whatever that came down was immense.

He was damn sure it was nearly on par with God himself.

The leader of the Four Great Maous (Satans) narrowed his eyes at what was in front of him. he waved a hand and blew the large amount of smoke that was obscuring his vision away. The powerful gust cleared the smoke and the redheaded devil's eyes widened.

A monstrous crater that spanned for miles in radius and nearly a mile in depth…

Sirzechs shook his head; he could save his awe for later. As he drew closer, the devil had to input more energy into his barrier he made for himself. The power only seemed to exponentially increase as he slid down the inside of the crater.

Using his enhanced vision, Sirzechs focused his gaze unto the center of the deepened crater and saw a mop of blonde poking out.

Coiling his legs, the redheaded devil kicked off of with a powerful jump to reach the epicenter of everything. Once again, the Lucifer's eyes widened to the size of saucers.

At the center of it all was a blonde boy no older than his little sister.

Sirzechs was now fighting openly against the invisible force that was trying to keep him away from the boy. A grunt escaped from the devil's lip as a particularly large surge of energy nearly sent him flying.

Suddenly the omnipotent power vanished as the child sat up in an uncanny-like fashion. Immediately, Sirzechs found himself tense and on guard, his only instinct told him to run; the way the boy moved and remained absolutely still made his nerves grate with unease.

The small blonde whiskered child looked around almost aimlessly. The child's gaze passed over him without a hint of focus.

"Wow, that's a lot of punch." Muttered a voice next to him.

"I'm glad you got here so fast Ajuka-kun!" Sirzechs said, not even glancing at the green-haired man next to him.

"Well you did say emergency, did you not?" the creator of the Evil Pieces said. The Chief Advisor for the Technology department then went on to say, "This certainly is intriguing, the output of the power is insane… I'm struggling to even stand here."

"Did you bring what I asked you to bring?" Sirzechs asked calmly.

"Of course I did-"

Sirzechs and Ajuka's conversation was interrupted when a wave of energy washed over them, threatening to send them sailing if they didn't have their powers holding them down

"Where am I?" The voice was harmonious and melodious yet foreign. Power radiated from the voice and Sirzechs and Ajuka immediately rushed him while coating themselves in demonic energy.

The devils couldn't understand him. Sirzechs didn't know what to make of the boy's tongue. It was no language he's heard in his very long life. Ajuka on the other hand had a nagging suspicion that he's heard that language somewhere. However, he couldn't pinpoint it, the language that the boy just spoke in didn't even sound like words... it sounded like...

Music.

The boy narrowed his eyes at them but otherwise made no other move to stop them. He was honestly curious as to what they could do to him. He was powerful beyond comprehension and he knew it. He briefly wondered what color his wings were now.

Letting a yawn escape him, trees were sent sailing, craters were forming, rocks and mountain were shattered at the sound of his voice.

'So it is gone? I suppose that makes sense... interesting.' He looked down at himself and frowned. This was what he looked like when He took him. Of course, the child was only a child in physicality… mentally, he was almost as old as Him.

He sighed when the green-haired man began struggling to get an inch closer when he was several feet away. The red-headed man was faring a bit better, seeing as he was a within a feet-and-a-half radius. He temporarily held his power and watched with amusement as the two other beings face-planted at the sudden disappearance of the force that they were fighting against.

The child closed his eyes and tried reigning in the laughter that was threatening to spill out.

His voice was now destructive instead of harmonic and peace-spreading.

Until he found a way to seal his own powers, he wouldn't be able to speak-

Immediately the whiskered child stiffened, an odd sensation passed over his body. Looking down, his eyed widened slightly at seeing the green-haired man's hand shoved deeply into his chest, right where his heart was.

He tilted his head, 'Why does it not hurt?'

Suddenly Ajuka screamed at Sirzechs.

"Sirzechs! Power! Now!"

Immediately, Sirzechs poured a massive influx of energy into the back of the green-haired man.

When Ajuka felt the power flowing through him, he fished in his pocket with one hand and brought out a small square-like object that seemed folded up. He unclipped the latch that held it together and it revealed an oddly designed board with little toys on it.

Naruto leaned in closer and observed the toys and found that they revolved around what seemed to be a castle theme. He saw what looked like a horse, a castle tower, a crown looking one that was being shoved into him and there was another-

Wait what?

Naruto scratched his cheek as the green-headed man began speaking all the while shoving the odd figurines inside him.

"I command thee to obey myself as one of the four great devils! You shall rise and pledge yourself as my queen! Under my guidance will we flourish- gah!" Ajuka's speech was cut off as he was both physically and violently rejected.

Likewise, the red-headed man next to him was thrown along with him.

Naruto looked down at his chest and touched where his heart was. 'Hmm… I still feel a bit odd, I wonder what these people did…'

"Ajuka, what the hell happened!? Wasn't that a mutated queen piece?!"

"I-I-I don't know! There's no will or life I can command! It's just-" he shook his head with disbelief, "It's just not there!"

Sirzechs gritted his teeth and locked his jaw.

"Ajuka, give him the mutated pawns pieces; all of them."

At the words of the leader of the underworld, Ajuka became slack-jawed. "But a mutated piece is for strong individuals! Three mutated pawn piece are only for beings that are on par Ultimate-class devils! That's around our power level! If we subject the child to all eight, he can-"

"DO IT!"

Again, the child watched them curiously as surged forward onec more. This time, the child decided to observe what the man was doing. Ajuka held both hands in front of him and a green magic glyph appeared.

Out of that glyph came out a more regal looking version of the little case of toys he brought earlier. As if it had a will of its own, the case pop opened and eight small and identical objects were sent flying at him.

The child expected the small figures to bounce off him, but was surprised to see them merging with him- well, the objects were trying to. The figures were not going to get through his barrier. Slowly but surely, the pieces were being pushed back away from Naruto's body. Sirzechs narrowed his eyes and grabbed the rest of the pieces.

He threw them all at a high speed towards where the mutated pawns were being forced away against the ummovable force of energy.

Ajuka gaped and cried out in alarm.

"Sirzechs! You fool! That was all the pieces! Don't you know what could happen?! Do you know how much powers behind all of those-"

Said redhead ignored his friend's spiel about the dangers and repercussions of mutated chess pieces. He allowed himself a triumphant smile when the pieces finally began overpowering whatever was stopping themselves from merging with the powerful child.

Said child look on curiously as the pieces fused with him self. He felt no different-

It was quick and sudden; almost to the point where he didn't register it. It was too late, he only had a split second to realize it. he was going to pass-

His conscious blacked out.

Sirzechs allowed himself a small breath of relief.

Ajuka just gaped at the child.

"The boy… absorbed every piece? Every mutated piece?! How-how!? WHAT!? HOW IN- OH MY-"

Ajuka fainted.

Sirzechs used his magic to contact and summon for his faithful wife and queen. He already felt his conscious ebbing away into darkness at the energy he just exhausted into fighting against the boy's aura, transferring energy, and just the situation overall.

Before he could escape into the sweet bliss of unconsciousness, Sirzechs just realized how powerful the child had to be to encompass 15 mutated pieces.

Just how powerful was this boy to encompass 15 mutated pieces?!

'Dear Satans, I hope I did the right thing…'

Sirzechs knew one thing before he passed out.

This child was going to catalyze something big in all the realms.

The Guardian of Eden

A/N: Yeah, relatively short chapter, I know. But this is just the first chapter, an intro of sorts. Next chapter will be longer but won't be for a while. Obviously, how popular this story becomes will change the amount of time I spend on the story.

Pairing?

Rias, Akeno, Gabriel,

Issei will ONLY be paired with Asia.