Inside a warehouse we see Rias and her peerage, Team RWBY, Team JNPR, and some of class 1-A standing bruised and exhausted in front of a grimmized version of a gorgon.

Yang: What are we suppose to do, this thing's to fast for us to hit and it hits like a damn freight train.

Izuku: We have to think of something, if we don't......w-we'll die...

Issei: Like hell I am, when I still have my dream to complete.

Koneko: Can you forget about your stupid harem king dream for one second and focus on the damn enemy.

Issei just growled and began boosting building up his power. Blake and Yang rushed towards the Grimm to try and hit it but it quickly maneuvered and dodged their strikes before whipping them with it's tail sending them flying back. Todoroki tried to freeze it to stop it's movements, but it jumped over it. It then spun it's tail swatting away both Izuku and Bakugou who had jumped after it to try and intercept it. It clamped onto the ceiling and quickly slithered across it dodging a lightning bolt from Akeno and P.O.D from Rias.

Weiss used her glyphs to send ice shards at the Grimm, to which it responded by jumping off the ceiling, maneuvering around them and soon landed in front of her backhanding her into a wall. Dodging after hearing a gun shot it looked behind itself and glared at Ruby who had fired a sniper shot at it. It was about to launch at her but stopped when it heard Issei yell at it.

Issei: Stay away from a future member of my harem bitch.

Turning, the Grimm sees Issei rocketing towards it, his fist with the boost gear reeled back. Seconds later his fist made contact with it's face, but it had no effect against it shocking Issei and irritating the Grimm.

In response it swatted Issei's hand out of it's face grabbed him by his neck and shoved it's claw hand straight through his abdomen.

Rias and her peerage(minus Koneko): ISSEI!!!

Koneko: *thoughts* Serves you right, dumbass

Seconds later it pulled it's claw out of the devil and tossed him towards the rest of the Union students. Opening it's mouth, it let out a sonic scream sending everyone flying into the wall behind them, injuring and stunning them. Slowly the Grimm slithered over to it's now downed prey, ready to kill them all. It raised it's now bloodied claw ready to bring it down on them. Everything was silent, until it was broken from the sound of a gun being fired. The Grimm let out a pained screech as it's shoulder was ripped open, shocking the Union students. A man dressed in all black appeared in front of the Grimm and kicked it sending it across the warehouse into a bunch of containers. When the figure landed the group got a good look at him.

Before they could say anything the Grimm busted through the containers and screeched at the man and rushed towards him. The man simply pulled out a knife and crouched down while twirling the knife.

He dashed towards the Grimm. Once they got close to each other the Grimm attempted to slash at him, but he jumped over landing an axe kick to the back of the Grimm's head stunning it and causing it to stagger back. The man than pulled out an AK and began to unleash a hail of bullets on the Grimm. The bullets ripped through the Grimms body causing it great pain, though it soon let out a roar of anger and rushed at the man swiping at him with it's claw, only for him to dive out of the way and get behind the Grimm. Firing upon it again, hurting it more and angering it further, with it trying to swipe at him again only for him to dodge it again. Getting behind it again he unleashed another round of bullets, with the Grimm trying to attack him again, with him dodging it again irritating the Grimm further and causing it to let out a roar leaving it open for the man to land another axe kick to it yet again.

Izuku: H-He's so fast.

Bakugou: How the hell is that bastard doing that, when we couldn't do shit to it.

Ruby: He's so cool, look at him go he's making that Grimm look like a push over.

Yang: Yeah, and with that speed and stamina I wonder how he is in bed

The Grimm infuriated reeled it's head back and opened it's mouth ready to unleash another sonic screech, but the man quickly pull back out his knife and threw it at the Grimm. The knife impaling it right in it's throat, causing to start scratching at it's throat while letting out gargle screeches. Seeing the Grimm distracted by the it's pain the man raised his arm that look demonic in nature, with white electricity starting to surround it. He then stabbed his hand into the ground causing the white electricity to spread into the ground and then head straight towards the Grimm.

Once the lightning reached the Grimm, spikes emerged from the ground stabbing the Grimm in multiple places before a final spike came up and stabbed it straight through the head taking it off and freeing his knife, to which he catches. While the Union students looked on in complete awe and amazement, many of them having different thoughts running through their minds. Rias was thinking of a way to convince him to join her peerage, Izuku was incredibly interested and amazed by his quick and strong he was along with his skill with guns. Issei was pissed that this random guy just appeared and showed him up, Ruby was in complete amazement at how cool he was and Koneko felt something familiar about him. The man let out a small sigh, before he began to walk away but was stopped when Ruby used her semblance to get in front of him.

Ruby: That was so cool when you totally kicked that Grimm's butt. You were like "bang bang bang" and the Grimm was like "rawr" and and and.

Man let out an annoyed grunt and shoved her out of his way.

Yang: Hey!!!

He looked back at the Blonde.

Yang: Apologize to my sister asshole, she just wanted to talk to you.

He just ignored her and continued to walk away. Inraged Yang launched forward towards him, with him responding by dodging her punch and kicking her in the stomach and then in the head sending her rolling back.

Man: Dumb bitch.

The other Union students glared at the man, but Izuku stared at him shocked.

Izuku: That voice, it can't be.

Everyone stared at him confused, while the man just stood there.

Izuku: You're..................(Y/N)

Everyone snapped their gaze onto the man shocked and the man began to laugh.

(Y/N)?: Of course it was the damn nerd who found out.

He reached up and took of his headgear revealing his face to them.

(Y/N): Sup, bitches

Bakugou: How the hell are you here, you're supposed to be dead.

(Y/N): Am I, sorry can't remember.

Rias looked to his arm.

Rias: That arm, I can sense demonic energy coming from it, how did you get it.

(Y/N): None of your business cow.

Issei: Hey!!

(Y/N) looked over to Issei who was healed by Asia during (Y/N)'s fight with the Grimm and saw him glaring at him with his boost gear.

Issei: Don't you dare talk to buchou like that, you worthless bastard.

(Y/N): Sorry I don't take orders from idiots.

Growling Issei launched himself at (Y/N) going to punch him. (Y/N) catches his fist and twists, then pulling out his Handcannon aiming it at Issei's head before getting an idea and aiming lower causing Issei to go pale and (Y/N) to give a maniactic grin. Seconds later he pulled the trigger making Issei let out a high pitched scream and he tossed him away.

Rias and her peerage(minus Koneko): ISSEI!!!

Koneko just chuckled, while the other stood there shocked. (Y/N) smiled and pulled out a flashbang grenade pulling the pin.

(Y/N): Later....

He drops the grenade, making a burst of light and once it disappeared he was gone, leaving all the Union students there in shock, Koneko smiling and Rias and the rest of her peerage trying to heal a scream Issei.

Timeskip brought to you by memes(not mine).....

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Far out in the forest of Union City we see (Y/N) jumping from trees until he makes it to a house in a small clearing. Jumping down to the door he lets out a sigh of contempt before entering. Once he entered, his attention was immediately draw to the sound of the TV. Looking over he sees a black hair man holding a controller.

Sitting next was ginger hair boy wearing a green shirt who was also holding a controller.

(Y/N): John, Pico.

They both look back, John smiling at him.

John: Hey there (Y/N), welcome home.

Pico turned his head back to the TV.

Pico: Yeah hey.

(Y/N): So what are you two doing.

John: Oh nothing much, just kicking this ginger pricks ass

Pico glared at John.

Pico: Shut it Tank bitch

John: How about ya make me, Mr. Shoot first and ask questions later.

The two glared at each other, while (Y/N) just chuckled and was about to say something but was stopped when he felt arm wrap around his waist. He was then pulled into someone's lap.

???: Took you long enough to get home.

Looking up he sees a girl with long black hair with a blue hat that had a cassette tape on it.

(Y/N): *chuckles* Sorry C.G, had to deal with some idiots from the past.

C.G pouted for a second before smiling, holding him tight.

(Art not mine)

C.G: Well I guess it's okay, but I expect extra cuddles tonight, okay.

(Y/N) chuckled at this.

(Y/N): If you want it, you'll get it.

C.G smiles, while she continued to hold him. Looking over to John and Pico, (Y/N) sees John covering his mouth trying not to snicker and Pico making a gagging motion causing him to roll his eyes. With that the camera fades to black.
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I Hope You Enjoyed