Disclaimer: I only own the plot.

(Issei P.O.V)

….. Silence feel the area. No one dare making a move as of right now me and my teammate together with two other people from student council were surrounded by both Senpai and Kokabiel. I'm not really understand what happen but what I do gather is that this Senpai and Kokabiel are not the real one… it was just a clone but their abilities equal to the real one.

Tap… Senpai clone make a step and that mark the beginning of out two ways battle. Kokabiel spread out his wing as a dozen spear of light appear around him while Senpai make a dash at our direction.

*Swoosh**boom**Clang*

Kiba and Xenovia intercept Senpai attack while Buchou Akeno-san and the Loli girl fire a magical attack before Kokabiel could even do anything. As for me I don't know which one to go at. On one hand Kokabiel is a bigger threat considering who he is but on the other hand I'm also worried leaving the other to fend of Senpai. His power is unpredictable considering that he even managed to fight me equally even when I'm in Balance breaker mode.

*Basha* Kokabiel open his Ten wings as he take flight to the sky. Buchou, Akeno and the Loli girl went after him.

"Sigh… I still don't know what happened but fighting the one of the leader of Fallen Angel sound fun. But this isn't any of my business so I guess I'll help protecting this girl for you." The student council Member Yura said to me as she went protecting Asia which leaves me alone considering that Koneko-chan is standing near Asia protecting her with that girl. That a good idea considering that Asia doesn't have a mean to protect herself except from Raisei which I have to say doesn't really help much against our opponent.

Which one should I chose? It obvious of course. Looking up above I can't even see the figure of Kokabiel anymore. Just what is this place? It look more like some sort of empty space fill with line and number. If I have to say it feel like I'm in some sort of digital world. Anyway… since I'm incapable of flying except when I use [Sacred Teal Wings] I can only target Senpai who are fighting on the ground.

"Yosh… gotta finish this fight. I still need to help Buchou and the other after this." I said this and at the same time the Counter on my Sacred gear hit zero. "Let go!"

[Balance Breaker!] I activate my Balance breaker and the result is….

…..nothing.

"Wha- what happened? Why can't I use Balance Breaker?" I ask Ddraig with a confused tone. It works fine last time so why couldn't I use it now? Does that mean that last time was only a fluke?

[Sigh… i don't want to admit it but it seems It was true…] I can hear Ddraig sighing as if he just found out about something that he rather didn't know.

"What is it? Do you know something about this?" If anyone knows it should be Ddraig.

[Telling you the reason would only confused you right now but what I could tell is that you can't use Balance breaker as long as you don't recover the missing piece of yours. That is the source of your power after all…] He said all that but for some reason he doesn't seem to like it very much. Just what is it that had been missing from me?

Anyway… since I can't activate Balance Breaker my sacred gear return to its normal form. Guess I got no choice but to fight in this condition. Still just what kind of thing that was missing from me that could be my source of power? It must be something amazing because without it I can't even use Balance breaker.

[Boost!] My Sacred gear let out a sound as I join the battle against Senpai.

XXXXXXXXXXXXXXXXXX

*Boom* Rias Fire magical blast fill with power of Destruction at Kokabiel but her attack easily block by him. This is Kokabiel… one of the leaders of Fallen angel. It hard to believe that this is just a clone in which power equal to original.

They need at least an Ultimate class Devil to take down this kind of opponent. Not even Akeno who seems too had awaken to the power of her Father could be a match against him.

[Falling Star!] in an instant Kokabiel were surrounded by a dozen of floating rock. Some were cover with fire, some were made of ice while some were surrounded by lightning. Each have different properties but what she knew is that the it was aim at the three of them.

With a wave of his hand it shoots out like a bullet at the three of them. Charlotte stood in front the two of them as her body glow.

*Boom*

Rias cover her face from the shock-wave of the result of the collision.

"Charlotte!" Akeno shout. She look worried… seems like this girl have become something important to her though she don't know the rea- guess she knows now.

Standing in front of them was Charlotte with a veil of light acting as a shield from the attack but that not what caught Rias attention. What caught her attention were the six black wings on her back. Without a doubt that was a Fallen Angel wings.

"So she is the same as you Akeno?" Rias ask just to confirm as Akeno nod. It seems she already knew about it with would explain they good relationship.

"Nee-san… I will be going full power now." She said and after that another set of wings grows from her back.

"Haaaah!" With a cry a blast of magical energy made of light shoot at Kokabiel from her body at high speed that Kokabiel doesn't even have the time to react.

*Kaboom*

XXXXXXXXXXXXXXX

"Toryaaa!" Xenovia slash with Durandal but Senpai easily avoid the attack and if not for Kiba timely interruption he would have counter Xenovia attack already. Without boosting there no way for me to match Senpai speed so I mostly tried my best to cover Xenovia and Kiba attack.

[Boost!]

That was my sixth Boost. According to my experience with Senpai the third Boost should give me a chance to defeat him but I have to be careful because against an opponent like him just having the chance of defeating him wasn't going to be enough. I need to make sure that I can beat him.

"Issei, he's coming after you!" Hearing Kiba voice I snap to realities as I notice Senpai is charging at me. He must have decide it would be dangerous to let me Boost myself anymore. Guess I've got no choice here.

[Explosion!] Not the explosion that Senpai use… this is me Boosting myself.

I can feel a surge of power inside me…. as I raised Booster Blader blocking Senpai sword. There's no time to waste… I only have ten second so I should defe-

[Dispel!]

Senpai sword suddenly glow and just like that I can feel a surge of energy inside me disappear. Let not say Ten second a second barely pass but my power had been reset to normal already. I forgot that he could do this. If I'm not mistaken this only possible as long as I wasn't hit by that a spell during the moment of my power up. After that it doesn't matter even if I got hit by it… It won't affect me at all at least that what Senpai told me. For all I know he could be lying but I doubt it considering he not the type to give false information.

"Issei!" Xenovia look worried as he charge at Senpai who are locking sword with me. For a second there I feel like this clone of Senpai smirk for a second there as if telling this is going part of the plan.

[Haste!] [Explode!] *Boom*

In a second Xenovia fall to the ground. My mind still trying to process what just happen. Apparently Senpai in a split of second use the opening that Xenovia gave because of me as he strike her down with Derflinger.

With a clang Durandal fall to the ground together with Xenovia. Judging from her condition she still alive so I didn't charge at him. It would be stupid to rush at him like that. If I let my guard down even for a moment it would be the end for me…. or so I thought because Kiba quickly charge at him as if he desperately want to stop him from doing something.

[Starbust Stream!] Kiba with two Holy-Demonic swords in his hand strike at Senpai at high speed leaving a sword trail but Senpai counter attack with his own move.

[Dispel!] The light cover the Clone of Derflinger and then he swung the sword at the speed I can't catch up. Looking from my perspective it as if Senpai was swinging two swords in his hand despite that he was holding one. [Snake Bite!] Senpai called out his attack and as soon as his sword touch Kiba sword the Holy demonic sword shatter into million pieces before disappearing from view.

"Wha!" Kiba widen his air while in midair but Senpai attack doesn't stop there. The next thing I know on his other hand was another sword. No… it not just another sword.. It was a weakness to us Devil. On his other hand was Durandal which he pick up from the fallen Xenovia. Now I know why Kiba desperately want to stop him.

If Senpai get a hold of Durandal it could be a nightmare to us which is already happen with Durandal on his hand he's about to move.

[Starbust Stre-]

[Count 5: Earth]

I can't let him finish whatever it is he about to do as I strike Booster Blader on the ground a spike emerged from the ground where Senpai is but he noticed my attack as he jump out of the way. At any rate for now Kiba is safe from receiving a full brunt of Durandal attack. There no way he could survive being cut by Durandal at full power.

"Thanks for the help Issei-kun." Kiba said to me and I can tell he mean it. If not for my interference I don't think he would be standing here right now.

"Think nothing of it, were comrade after all… but still it would be dangerous to leave Xenovia right here." My own attack barely hit Xenovia who was laying on the floor unconscious.

"I'll take care of her."

"Gah! Ko-koneko chan! When did you-" Before I noticed Koneko-chan had stood beside me as she carried Xenovia away to where Asia is.

Right now there only left me and Kiba. It not like I want to badmouth Xenovia here but without Durandal she won't be much help against Senpai. Being a Devil she won't be able to use her usual sword of light and not to mention her abilities is mostly focus on the way she wield Durandal. There almost nothing she could do in this situation.

As if the situation wasn't already worst Senpai clone suddenly bring out something from his pocket and I recognize that very item.

[Fusion Unit!] And with that two a light engulfed both Derflinger clone and Durandal and as soon as the light dispersed on Senpai hand was a different sword.

[Duran-Derflinger!]

Hm… what with this situation that keep getting worse. On second thought… just where is the real Senpai?

XXXXXXXXXXXXXXXXX

"That for Saito Senpai wherever he is right now." Charlotte said after she fires a blast of light at Kokabiel. The fact that Kokabiel escaped Saito still haven't escaped her but she believe that he won't die easily. The smoke clear revealing Kokabiel and it seems her attack did some damaged to him but it wasn't enough to defeat him with just one blow.

She kind of expecting this but it still frustrate her that her attack doesn't did much damaged at all. At this rate she won't be able to achieve her revenge. The one she was after is certainly much more stronger than Kokabiel and if she can't even damage Kokabiel there no way she would be able to defeat that guy… the Fallen Angel with twelve wings on his back.

"Even after receiving that kind of attack it still wasn't enough… how are we supposed to beat him?" Rias ask but of course no one could answer her… even with the three of them it won't be enough to beat someone on the level as Kokabiel.

They are nothing they could do that much they knew. That why when a black sphere of energy start to gather in front of Kokabiel Charlotte knew that there was nothing they could. She heard from Ajuka sama before when she was questioning him about the leader of Fallen Angel.

There is one Kokabiel ability that is almost impossible to dodge and that technique is the one he was about to use.

"We got no choice, shoot out every last drop of energy you have or else we really going to die." Charlotte said as she starts gathering all the energy she could muster with all eight wings open. It was hard considering she still can't control her eight Wings mode but she has no choice in the matter.

An Aura of destruction can be felt from Rias while Akeno was giving out an spark of Holy-lightning. Charlotte also doing the same as she a spear of light forming in front her. Even an amateur could tell that it not just any normal spear of light that she created. It have thousand time more potent of light energy in the spear that if a could turn even the Middle class Devil to ash just by making contact grazing with it.

[Black Star!]

At the same time Kokabiel fire his own attack the three had fire them already.

[Raikou!]

[Destruction Wave!]

[Divine Lance!]

The three attacks met with Kokabiel own attack and then….

*KABOOM!*

A large explosion accompany by a strong shock wave that if they are not careful they would have been blown away already.

"Huff… Huff…" Charlotte clearly doesn't have any more energy to spare and so were Rias and Akeno but it doesn't seem to be the same with Kokabiel. As soon as the smoke clears it reveal Kokabiel ready to shoot out another [Black Star!].

With this they are definitely done for. They doesn't have any more energy to spare for the second one while Kokabiel could still draw out the energy from 'Issei energy' as Senpai called it. the energy was near endless and if it was turn to a weapon it could easily wipe out a dimension with ease.

[Black-] Kokabiel about to shoot out another attack but a voice interrupted him.

"I won't allow it! [Explosion!]"

*Kaboom* an Explosion erupt in front of Kokabiel as the black energy vanish as soon as it was hit by the Explosion.

"This voice…" Rias said as she recognize the voice. It not just him but Akeno and Charlotte both recognize the voice.

"Senpai!" Charlotte cried out looking for the whereabout of the voice and soon she caught a figure riding a… Horse? No… it was a pure white Horse but on each side was a wings.

"A Pegasus?" Rias said looking confused. That right… Senpai was currently rising a Pegasus as he slowly descent on the same level as them.

"Yep… it a Pegasus…it even listen to what I said."

"Neigh…" the Pegasus let out a sound as if saying something which they didn't understand except for Saito.

"Eh… don't be like that…aren't we friend?" Senpai replied back to the beast.

"Nrrrghh…"

"Hahaha… you don't need to said that. You still came after I call you wasn't it?"

"Nggggrrrhhh"

"Yeah.. yeah… you sure are noisy."

They continued watching a one man show or rather it looks as if Senpai just having conservation with the Pegasus.

"Yo… Rias, Akeno… how dare you just throw me out against Kokabiel like that? I was on the verge of dying because of that!" Senpai complain to Rias and Nee-san. He must have hold a grudge against them a bit but what did he mean by on a verge of death?

"I should ask you the same! All of this happens because of you in the first place! Not to mention what with that clone of yours?! Because of that we miss our chance on escaping from this place… and you seems fine from someone who said he was on the verge of death!" Like Rias said Saito-senpai look just fine. There's no even a single wound well except the blood stain on his clothes. Just where does the blood come from?

"Geh! Ahahaha… well… that was part of miscalculation. But my clone existence is not my fault. It probably came from Yura battle earlier." He said and come to think of it the last time she check on Yura she were fighting against an Npc Saito. That explains where it come from at least.

The Battle Royal must have pick up Saito data due to Yura battle and coincidentally Charlotte was using a Back door trying to escape so the Npc when after them without their noticing.

"Well anyway… Tabitha… that a nice wings you got there… guess being a Fallen Angel suits you…" Senpai said casually which make Charlotte realize that she forgot to hide her wings. she quickly tried to cover it but it already too late… Senpai already saw… but that not important.

"You knew?" she said though it may lack emotion she definitely surprised by Saito knowledge.

"Yeah… Ajuka told me when I ask about you." Ajuka-sama told him? He must have trust Senpai very much if he even willing to tell him something that not even other high Ranking Devil knew of except the Maou. If they knew there is a Fallen Angel in their midst not to mention being related to the Maou it could cause a huge scandal and for worse it might cause a little rebellion. If not for her status as Fallen Angel there no way she would be able to get information about Onee-san being a Fallen Angel herself.

"You don't mind? Me being a Fallen Angel…" She has to ask. After all Fallen Angel are still consider the enemy of Devil that why she have opt to keep it a secret from everyone and yet Saito already know from the start.

"Should i? Did you forget that I'm just a 'Human'. It doesn't matter to me if you're a Devil, Fallen Angel, or even Angel. Tabitha is Tabitha to me." He said things like that as a matter of fact and Charlotte can feel her face blush a little as she turn around not wanting to show her face.

"It's Charlotte…" She said on reflex though to be honest it kind of comforting hearing him called her Tabitha. It feels as if the name was special when it comes from his mouth…'Flash' …. Eh? What was that. for a split second there an image of her and Senpai stood atop a cliff kissing float on their mind. She can feel herself blushing but the image disappear soon the same way it disappear.

"Oiiii…. Did you catch fever or something. Your face beet red Tabitha." At Saito word Tabitha return to realities but she still can't shake off that image completely out of her mind.

"Nothing…" She answer… and while this is happening Kokabiel doesn't make any move at all. There might be something wrong with the system or maybe it was set not to attack while a conservation is going on but either way Charlotte was grateful because it let them catch some breath.

"Is that so… then… let return to the fight shall we." As Saito declared that Kokabiel start moving a little as if knowing that a battle about to start.

Looking from his back she remembers her first impression of him. It all start when he mistaken her letter for a love letter. At that time when he reject her she doesn't feel any feeling at all but right now remembering that he indeed had rejected her made her feel sad somehow.

No.. Now not the time to think about this. Kokabiel had started making his move as he summon a dozen spear of light but Saito doesn't falter as he look at Kokabiel head on preparing to counter his attack.

"Would you be okay Senpai?" She ask looking worried even if Saito didn't she was. When Kokabiel appear all of a sudden without him she really had thought something worse happen to him but she feel relief considering he was fine but that doesn't mean anything if he was about to fight against someone which even with the combine power of Akeno, Rias and her can't beat.

"Heh… I'll be fine. Nothing can scare me except Louise and Sona explosion!" He charged or rather the Pegasus charged ahead while Senpai was riding him.

XXXXXXXXXXXXXXX

(Saito P.O.V)

I ride the Pegasus as I instruct him to charge through him.

The sound of a dozen spear of light shoot out like a bullet can be heard but I pay it no mind as I keep charging. A spark appear on Derflinger preparation for my attack. the Pegasus move skillfully as he avoid the spear of lights like it was nothing even though the number is about a thousand of them he didn't even let down of his speed at all.

"Neughhhh…(This is nothing to me.)" He said in a bragging tone.

"Heh... then don't let down your speed and just charge straight ahead… I'll handle our finishing attack." I said while holding on to him tightly. It would be bad if I fall. On a side note the reason I could talk to him is thanks to Windalfr which allow me to communicate with any animal or beast.

I still remember the day I met him…. is what I like to tell but now not the right time. The short version is I met him when I was gathering some ingredient and material. He was drinking a water in a spring. Which a flash of Windalfr I easily subdued him and after some Blackma- I mean 'talk' he agreed to come to my aid whenever I summon him through the world door. It seems that this place is only blocking anyone form inside to go outside but it doesn't seem to stop anyone from outside coming in as prove when I managed to summon him.

"Yosh here we go…" I said as a white light start to cover the two of us as we charged straight at Kokabiel. Any spear of light that came contact with us while in this state immediately disperse into nothing and this only make Pegasus to increase his speed. "Take this!"

[Rending Explosion!]

The light brightens and at the same time we rammed into Kokabiel at high speed.

*KAAABOOOOOOOMMM!*

A loud Explosion as a smoke feel the area as a result of the explosion.

From outside one could see a figure of Kokabiel flying… no it look more like he got throw from inside the Explosion as his back hit the Invisible wall. He was about to fall but he managed to stop his fall as he slowly ascend and from one look I could tell that he was heavily injured from that one attack just now. His wound slowly healed but it wasn't enough to heal him completely from the damaged he just took.

I can't let this battle drag on or else he'll be recover by then.

"You three go and help Issei and the other. I'll handle him by myself!" I shout to the three who are shock by the spectacle infront of them as they snap out of it.

They look unsure but they agreed nonetheless. Even I could tell that they had run out of energy just from fighting Kokabiel here.

"Neigh? (Oi boy… you still haven't told me why we were fighting one of the leader of Fallen Angel not to mention you can easily control me and yet you don't… why?)

Okay… first of all how the heck something so short could turn into a long word? Did something wrong with Windalfr Translator? And as for the reason I didn't control him is simple. It a Hassle really. I have to focus on the battle while focusing on controlling him… that to much work I tell you… so that why I gave him the freedom to make things easier. Let just say I trust his decision. Hearing that he seems to snort but doesn't say anything to retort.

After that I gave short explanation about the situation. As expected, there is no way for him to understand on a short explanation so I told him to concentrated on the battle at hand. Kokabiel doesn't seems to be playing around… not that he was playing around before but his attack now just become more brutal.

Ten… no, twenty Black star forming around him. and each one have the same power as the real one. One hit from that is enough to destroy the whole city so I don't think there no need to say anything from twenty of them should i?

[Black Starx20!] a barrage of a godlike speed attack shoot at the same time.

[Haste!] I caste Haste and instead on myself I cast it on the Pegasus as his sense of time slowing down allowing him to avoid the barrage of Nuke magic. And I have to be thankful of my position which is set above from him and because of that the attack past through me and head through to an endless darkness. I still don't know what this place is but doesn't seem like there are any end to it ceiling or if there even a ceiling in the first place. All I could see is an eternal darkness above me.

If by any chance the attack was hit below us there is a high chance it could hit Issei and the other and that will definitely be instant skill. With that thought in mind I try to make sure that I locate higher up than where Kokabiel is.

As the attack was dodge I take out an item from my Inventory as a Hexagon shape crystal appear on my hand.

"Neiiighhhhh…(by the way… why didn't you just summon 'him' instead of me? I'm sure if you use 'him' the fight would be over in a second. There no one in the Universe that could be a match to 'him' after all.) Hearing he said that I stop what I was about to do as I focus on him.

"Oioioioioi… you must be kidding me! It true that I could summon him if I want but the problem is my Windalfr is having trouble just to make 'him' calm down. There no way I could control 'him' and even if I could this dimension would probably be destroy as soon as 'he' set foot in here." I said to him before returning to what I was about to do.

"nghhh.(good point there…)" He said but I decide to ignore him for now. If I even tried to summon him, his very presence could destroy this Artificial Dimension due to not being able to contain his power. Not to mention just to summon him I would need a Giant [World Door] which would need magic that not even Derf in Max could be enough. I probable need to rely on Lifdrasir which I rather not unless it necessary.

Anyway… back to what I was doing I stare at the crystal for a second. I was planning to keep this just in case it could be used to return me back to Halkeginia but now that I know the truth I don't see any reason on keeping it any longer.

[World Gate!] With the enhancement I destroy the crystal with Derf… as a light gather in front of me as it slowly form into a… card? On a side note the Crystal have the same function as the one I use against Issei which allow me to synchronize which my Alternate self but the difference this time is that this crystal will only allow me to synchronize with my alternate self which possess a Talent or ability which solve the problem on synchronizing with the weak me.

"Oh… it seems like this time it was a card instead of that weird machine." Derf make a comment. Where was he just now? He didn't even make any sound during my epic clash with Kokabiel which isn't really epic considering I just charge straight ahead like an Idiot.

Hm… what a weird card. On a side note while this was happening a dozen of meteor tried to hit me but thanks to Pegasus skillfully avoiding it I can ignored them for now.

"Nrighhhhhh!(Oi! Don't just relax and let me do all the work! I cant keep avoiding this attack forever!)" Hm… he sure is noisy but I ignore him for now.

Anyway… I examined the car. There was one word I can read but cannot understand it meaning.

"Caelum Sentire? What that?" I said out loud on reflex but my question was answer.

"Niiiihhh…(I think it in Latin and it mean Heaven Feel.)" Pegasus answers me as he dodge a flaming meteor. I can feel the heat a little but that much is nothing.

Heaven feel huh… the only heaven Feel I know is that it was a Route from a certain Universe and this card is without a doubt not from that universe. Not only that there also a picture of me with my Chevalier cloak and a wand strap on my waist.

Doesn't look like I found more answer but what I did know is that, there is a Keyword need to activate it thanks to Lifdrasir for extracting the information for this card which seem to be an Artifact.

There nothing but to try again. With that I bring the card in my head as I said the keyword.

"Adeat!"

Sigh… i can still write more but I think I should stop here. For the chapter which wasn't part of the plan it sure take too long to finish, it been like what? Four chapters already. At this rate it could take a while before I could enter a main arc which I plan for the Volume 4 timeline.

Anyway… hope I could finish all of this by next chapter and honestly I'm kind of temp to end this with a rush but decide against it since a battle should flow out naturally, not to be rush for me.

What else… oh just for your information most of the name the magic I use is mostly came from other series if you recognize it while some was something I just think on the spot like Rias [Destruction Wave]. I can't help it considering that I never saw the author ever gave a name for Rias attack except it was called the power of Destruction and it doesn't seem like even her own finishing move have been a given a name yet.

Anyway… as for Saito abilities… let me just say this first while I will probably use some ability from other series that doesn't mean I will use the same procedure as that series. I will be using the ability that Saito already has and combine it with what HsDxd have to create a set of abilities similar from other series but with different procedure. on a side note i still didn't plan on revealing a new void spell that Saito got so please don't expect to much out of it.

As for Saito being a class of a servant unless I make a crossover in which this Saito is summoned as a Servant it definitely won't happen In this Story. I mean if it a class Saito is fall under the category of Human Familiar.

Okay… what else... oh about the Elf that came from Halkeginia they won't disappear. Since they already exist on earth which was support by many Systems. Think of Chaos like a system that support the dimension where Halkeginia is and if it disappear from it the dimension will lose it support and disappear. For example if a World Tree Yggdrassil suddenly destroys it could very well be the end for the Norse World or at least that what would happen in my fic. The canon HsDxd never did give any detail about it except from mentioning it in a sentence.

Also… I don't think I need to explain what that last word mean… since it was obvious which universe it come from. At last I could use the very first Ability I think of ever since I decide to writing in Fanfiction since I abandon the fic where it originally is.

Okay… that quite long and I think my fast update made up for dragging this battle and expect a new chapter in a few days from now….. Maybe.

See you again next chapter.