-PLAY THEME SONG-

-AUTHOR POV-

Overhaul: Give her back!

Overhaul then controls the mutations body as he uses the giant hand to go rushing at (YN) and Eri...

(YN): Hold on Eri!

Eri: O-Okay!!

As the hand was about to hit both (YN) and Eri, (YN) quickly dodges away as he jumps on top of it, and started rushing down to the arm and going after Overhaul, as he does, Overhaul tries to hit him, but (YN) jumps above Overhaul, lands behind him as he then swings a punch to Overhaul's face, afterwards, (YN) leaps away as Overhaul grunts and started rushing at him and Eri, (YN) picked up something as he then emits his quirk to create a si machine gun, he starred shooting Overhaul as energy bullets started hitting him, as the mutation body started getting hits from those bullets and leaving wounds, Overhaul waits his quirk to reassemble more body parts from the mutation...(YN) tosses the gun and continue and to run away and to hide behind a building, Overhaul strike the guiding down as it collapses and destroys everything...afterwards, none of them were found or seen...

Overhaul: Where could have they gone?!

Overhaul looks around...and to see (YN) on top of another building all of the sudden, tricking Overhaul as he now had another weapon made, it was a sub machine gun with a chainsaw attach to the barrel as (YN) leaps and dashed towards Overhaul and starred shooting him as Overhaul realizes and yet to take damage still, Overhaul swings his mutated giant hand towards him, until (YN) stopped shooting and yet to turn in the chainsaw and to start slicing the whole giant hand down, and afterwards, landing a brutal kick towards Overhaul's face and then leaping away and landed on the ground on feet...

Overhaul: NRRRGH!!! You arrogant bastard!!!

Overhaul swings the giant hand for a punch as (YN) then clenches his robotic hand and to swing his punch towards the giant's hands and to end up colliding, as they do, (YN) then use his robotic hand to grab the giant hand, and to use the full strength of it and his together, to rip it down from Overhaul as he then swings it and hitting Overhaul with the arm brutally as Overhaul collapses to the floor...But it wasn't enough as Overhaul started to grunt more and started getting up as he then disassembles and reassembles the mutation again for a new body part and still giant again...

Overhaul: I Won't say it again, give Eri back now!!!

(YN): Hell No!!!

Overhaul with pent up frustration he started to charge towards (YN)...(YN) as well charges up to Overhaulas he then leaps towards him and to land on top of him and yet to start throwing brutal punches towards Overhaul's face...

(YN): This *punch* Is *punch* for *punch* Everything you *punch* have done *punch* to ERI!!!! *punch*

With that last punch, (YN) manages to punch Overhaul's mask off and yet to leave his face all bloody...Overhaul try to use his quirk against (YN), but as he does, his quirk did no affect to him Knowing Eri's quirk is still going and still affecting (YN) a lot...

Overhaul: D-DAMN!!! *With her using her powers affecting to him, I can't use my quirk on him...the only way...is to get her off from him!!*

Overhaul reaches to Eri, until (YN) grabs and stops Overhaul, squeezing his hand with pressure as (YN) glares at him...

(YN): You won't lay a finger on her, EVER!!!

(YN) then Headbutt a Overhaul and to jump off from him and to land onto the ground...and yet Overhaul started to yell a lot with anger and frustration already as he wanted to kill (YN) badly...

(YN): *Damn it, he isn't taken down yet...what now?!*

He started to think...and as he does...he then realizes....what if he can create a weapon, a stent and powerful weapon that can end Overhaul for good....one, powerful huge weapon...and yet, he got it, he can create a weapon that can have one bullet and to end Overhaul for good...so, he rushes over to the fallen pieces of corpses he's cut from Overhaul's mutation body...

(YN): This should be big enough!

(YN) started to concentrate on his quirk as he began to turn the corpse into one huge weapon he has on his mind....and yet, Overhaul was getting up and he sees (YN)....

Overhaul: Okay you!!! I had enough playing games, I'm seriously going to kill you and Eri if I had to do it with force!!!

Overhaul started to charge up to him behind, as Eri looks behind, and to see Overhaul coming...

Eri: (Y-YN)...he's coming...!

(YN): Hold on Eri, I'm almost finished!!

Overhaul continue to charge as he was about to get closer...

Eri: H-He's coming!! (YN)!!

(YN): Almost!!! *Come on, Come on!!!

Overhaul was now getting closer and closer...

Overhaul: It's over!!!

Eri: (YN)!!!!

(YN): Done!!!

And so, Overahul was about to snatch Eri away from (YN), but (YN) suddenly quickly, turns around...and revealing the huge weapon he has made with his quirk...

Overhaul: WHAT?!?? What the-

(YN): It's over, Chisaki!!!! Say hello to my little friend....BFG...9000!!!!!!!!

(YN) presses on the trigger...as a huge green energy sphere was shot and dashes straight to Overhaul...and once it hit his body...the bullet suddenly made noises, and the noises was sounding louder and going faster...

Overhaul: YOU-

And yet, the bullet cause to self explode, and causing a huge explosion, pieces of corpses flying everywhere as (YN) was holding onto Eri and taking her cover, using shield as a human body shield for her
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After the explosion, smoke was clearing the way...as Overhaul's body was left with half of it, his hands were exploded, one leg, and yet bleeding a lot and to leave a huge gaping wound on his gut...and he can barely talk...

Overhaul: Y-You..Y-You-*coughs and gags* Y-You...g-g-give...h-her....b-ba....b-back.....

And yet...Overhaul stopped for a moment, as his body hasn't moved at all anymore....as he was pronounced dead...Eri looks away, hugging (YN)...

Eri: I-Is it over...???!

(YN) pats on her head, holding her and replies....

(YN): Yea, don't worry...it's all finally over now.

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Not quite, Eri's quirk is still going, and yet suddenly, it was going out of controlling, and started to hurt (YN)...

(YN): AAAAAAGH!!!! C-CRAP!!! *N-No!!! Eri's quirk! She can't control it and stop it!! N-Not good!!*

(YN) started to grunt in pain as Eri was scared and terrifying to see (YN) being tortured by her quirk...

Eri: N-No!! Stop this!! Please!! *I-I don't want to hurt him...I don't!! B-But I can't stop it...! Please...anybody...help!!!!!*

And suddenly...Eri's quirk was worn out...as well as her as she then shuts her eyes and doesn't open them, and yet to start trembling...(YN) was holding her as he was able to recover from that...

(YN): Wh-What???! She...manage to control it-

Aizawa: No...not really.

Suddenly, (YN) realizes to see Aizawa, Midoriya, Holding on Mirio, Ochaco, holding Nighteye, Tsuyu, Nejire, Amajiki and Ryukyu arriving...and they realize to see Chiskai's body dead...

Ryukyu: So...you did that.

(YN): I didn't had no choice...besides...he had it coming.

Aizawa: ...*sighs* Fair enough, besides, you're a vigilante after all.

Nejire: So...we did it??

Aizawa: ...Yea, our mission was a success.

Amajiki: Thank goodness is over.

Izuku: M-Mr.(YN), Eri! What's wrong with her??!

He realizes Eri trembling and whining a little...he touches her forehead and to feel her really warm..

(YN): *Shes...She's gotten a fever!* We need to call an ambulance now!

-END OF CHAPTER 21-