3rd person poV

Y/n stood tall as Asura ran up the mountain with a roar. Y/n jumped before spinning around and unleashing a wave at the demigod. Asura tried to block it before he knocked it away and jumped at Y/n.As Asura went to punch Y/n the Soul Reaper stopped it with his bare hand. Suddenly Y/n felt Issei's spirit energy causing his eyes to widen.

Y/n:(Mind)SHIT THE  OTHERS ARE IN TROUBLE!

Asura bashed his head against Y/ns before grabbing him by the face.

Asura: I'LL KILL YOU FOR MAKING MITHRA SUFFER!!!!!!!!

Y/n gritted his teeth before he aimed his hand at Asura's face. 

Y/n:SHAKKAHO!

Stunning Asura with the blast Y/n kicked Asura in the ribs;sending him flying into the mountain.

Y/n: I DON'T HAVE TIME TO WASTE! RIAS AND THE OTHERS NEED MY HELP DAMMIT!

Y/n  tried to flashstep towards them when he was stopped by a sudden blast. Y/n blocked it before he growled.

???: So your a Soul Reaper? your not as I remember in the report.

Y/n: Who the hell are you?

Mira: I am Mira... and I have come to beat you. I hope you can put up a decent fight.

Y/n: If your gonna stand in my way then I'll cut you down! 

Y/n charged at Mira with a Getsuga Tenshou before unleashing it. When the energy faded in the sky Mira  appeared behind Y/n and kicked him in the stomach sending him back. While as was sent back Mira charged at Y/n with a barrage of punches causing Y/n to block with Tensa Zangetsu.

Mira:Impressive but how long can you keep it up.

Y/n:AS LONG AS I HAVE TO YOU!!!

Y/n flashstepped behind Mira before he charged up a massive kido blast.

Y/n: Soren Sokatsui!

Mira turned around with a blast in hand causing them to clash. With the impact causing a Shock wave to shatter the mountain  glared at Mira. Before either could attack Asura appeared in a new form. 

Asura: STAY OUT OF MY FIGHT YOU WHITE HAIRED BASTARD!

Asura punched the two into the ground then stood.

Asura:(mind) Mithra... I swear i'll save you my daughter. 

Mira: You misguided fool I'll take care of you and the Reaper  here and now. I see no more use for you.

Y/n:Burn the heavens DIABLO!

Y/n entered his release form before aiming his blade at the two.

Y/n:I'm not done yet..

Y/n flew at Mira with a blast but was punched by Asura. Y/n stopped himself in the air before Mira  kicked Asura aside. Mira saw Y/n firing a Getsuga causing him to counter with a blast of his own.

Y/n:(Mind) No matter what..

Asura: I won't  yield no matter what..

Y/n/Asura: I WILL WIN THIS !!!!!!

https://youtu.be/2zjQKDiRtf4

While they engaged each other Rias and the others faced off against Issei and his Peerage. Izzy tried to punch Issei who only blocked with ease. Kiba and Xenovia jumped at him with a slash only to be stopped by the alternate Xenovia. When they two were knocked back Alter Xenovia  ran at them with a slash; shattering the ground.

Kiba:(mind) How is she so strong?!

Xenovia: (I don't believe it.

Alter Xenovia: Time to die for standing against Issei.

Xenovia and Kiba ran out of the way of her attack which leveled the building behind them. Alter Xenovia walked over slowly as she glared at them.

Alter Xenovia: Standing by Y/n side is so pathetic. Can't you see he's weak compared to Issei? I hate everyone who stands  by a Y/n.

Kiba: Why would you turn against your Y/n then?! 

Xenovia: That's right  you had loved your own once aswell! 

Rias went to help her peerage but was stopped by her counterpart.

Rias; GET OUT OF MY WAY!

Alter Rias:*smirks*  Why even stay with Y/n..  Issei stronger than he can ever be. We all know deep down Issei was always meant to be with us. Why can't your universe do the same and leave that weak trash?

Rias: I don't care about strength unlike you I will never give up on my love!

Rias fired  a barrage of  blasts at her Alter only for her to stand tall,

Rias; So what if Y/n is strong or not it's him that matters. I was forced to hurt him but I'll never make that mistake again!

Alter Rias: hehe Are you sure?

Rias: What are you talking about?!

Rias say Izzy was sent flying to the ground before the Red dragon stood. Issei laughed as he fired a blast at Asia and Gasper. 

Izzy: NO ASIA GASPER!!!

Izzy used promotion to become a knight and  tackled them. The area filled with Izzy's screams of pain while she took Issei's attack.

Rias: IZZY NO!

Akeno; You bastard!

Akeno fired a lighting bolt at Issei only for  a Alter Koneko to appear and stop it.

Alter Koneko: That was pathetic.

The Alter Koneko rushed at Akeno to attack her only for Ginjo to appear. Blocking the attack Ginjo stood on the ground next to Chad and Uryu who stood ready to fight. Issei stared at Rias then spoke with  a evil smirk.

Issei: You think your the first Rias who's made that promise? There have been million of Rias's who have promised to help Y/n. Let me tell you  a secret; they all broke it and join a Issei.

Rias went pale by this before she fired at Issei.

Rias: Your lying I wouldn't hurt Y/n! I REFUSE TO BELIEVE THAT MANY OTHER MES WOULD HURT Y/N!!!!

Issei endured it before he charged at them. Chad jumped up before punching Issei in the face.

Chad: Uryu now!

Uryu followed after before unleashing a barrage of arrows to overwhelm him. The Hollowfied Soifon saw this before charged at Uryu with an attack.

???: I REJECT!

Before Soifon's punch could land Orihime appeared and shielded the Quincy. As the Hollow Soifon went to attack once more she was kicked by her counterpart.

Soifon: You scum have no right to be us.

Rias: S-Soifon!

As Alter Xenovia went to attack her blade was stopped. As someone slashed her blade the knight's blade caused her to fall to her knee.

Izuru: As a member of the  13 court guard squads I'll  be your new opponent.

The other soul Reapers appeared and stood  ready to fight.

Yamamoto: Rias Gremory  this battle is far greater than you realize. Allow us to give our assistance in ending these evil monsters.

Issei: Ha it doesn't matter how many come here We'll crush you all. Why don't you just give up Rias and let your peerage into my harem.I'll spar your lives if you do.

Izzy: S-Shut up you evil bastard...We'll never join you! 

Rias: Izzy?

Izzy: We all would rather die than be with a creepy fucking monster like you! You think the Prez would just betray Y/n? I'LL KILL YOU FOR LOOKING DOWN ON US LIKE THAT! FOR THINKING WE'RE SO HEARTLESS!!!!

Issei: Everyone  will join me in the end. Your asses are no different especially we aren't the only other beings here. 

Irina: What are you talking about ?

Issei: It looks like your Y/n is special enough to have other universes wanting him dead. But For now your all mine!

Ichigo: LIKE HELL WE ARE!

Issei: Akame show them what happens when Defy me.

Fallen Akame: Yes Issei.

Akame went to cut them down when a giant Spirit energy was felt. Akame turned to see Kenpachi standing with the corpse of a alter Asia in his arm.

Kenpachi: *smirks* You bunch are really pissing me off. How can people so strong talk so fucking much? If you want to fight to the death then shut up and fight. Come on at me you Black armored bastard. We'll see if you can still talk big when I'm done hacking you to pieces.

Issei stood for a second before laughing as his body surrounded in purple energy. When it vanished a blast flew at Gasper. Mithra  saw this then ran to defend Gasper but was both were caught in the blast. As the cries of both the Orc and Mithra  echoed through the air Y/n and Asura suddenly stopped. Y/n and Asura starred off to where they were seeing the beaten Mithra and  Gasper laying on the ground.

Y/n/Asura: GASPER!!!!!!!!!!!!!!!! M-MITHRA!!!!!!!!!!!!

With tears in their eyes the two screamed out before Mira blew them away. As they fell into a crater Mira slowly approached it. But before Mira could do anything he was suddenly  sent flying by  a titanic blast on energy. As the crater  tore open it leveled all around it including towns and mountains.  

Mira:W-WHAT IS THIS BURST OF POWER?!

Out of the hole appeared Y/n and Asura now consumed by rage.

Y/n/Asura: GRRAAAAAAAAAAHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Before Mira could even attack He was Blown half by The Berserker Asura's blast. The Hollow Y/n and Asura soon appeared infront of Issei who stood in his juggernaut drive. 

Issei: A battle between monsters huh fine lets go!

The Alter forms of the girls tried to stop Y/n and Asura but were butchered into bloody pieces in seconds.

Rias: N-No...not again...this...THIS HAS TO BE A NIGHTMARE! PLEASE DON'T LOSE YOURSELF againY/N!!!!!!

To be continued