Izuku Midoriya, formerly as Izuku Yagi was experiencing hell. Since he was diagnosed as Quirkless his life took a 180 degree situation change. His mother Inko(Green Magnet), his step father Toshinori(All Might), his step sister Izumi and his friends(1A, but - Koda) started to make his life a living hell.
At the age of 7 he meet an orange dog with a chainsaw on his head. He was injured and Izuku knew it was a Demon. He give his blood to him for healing. Then Izuku and Pochita become friends.
Only Koda knew about Pochita, because he never hurt Izuku. He help him with his injuries.
But Pochita dies when Izuku was 14 and he became Izuku heart and he transformed into the Chainsaw Man. After that he meet a woman with red hair and golden eyes that said if he wants to work for her. Izuku immediately accepted. The woman reveal her name was Makima. And she reveal to him that Toshinori isn't his dad, his Dad is Hisashi aka the Pro Hero Wyvern.
Aldera Middle School
Izuku was sleeping on the desk. He was having a nightmare when Pochita died, but he couldn't do anything. He awake screaming.
Izuku:POCHITA!
The students looked at him. Only Koda understand what he was talking about.
Teacher:Yagi, don't scream in my class.
Izuku sit down.
Katsuki:Yeah, Deku. Sit down you useless Quirkless. And what stupid name is Pochita? What a stupid na....
He didn't had to finish because Izuku punch him in the face, knocking him on the ground.
Izuku:Never insult Pochita ever again, you son of a Bitch.
Teacher:Yagi, go back to you'r seat now!
Izuku looked at him with a glare that scared the teacher. Then a chain coming out from his hand and impaled next to the teacher head.
Izuku:Listen here, asshole. From this day on, the old Izuku is dead. Whoever stand in my way, I won't show any mercy.
The students started to feel afraid of him.
Izuku was called into the Principal Office. The students and the teachers were happy that he'll get punishment. However, in the Office was his boss, Makima. She threatened the Principal to give Izuku an immunity card and to leave her employer alone. The Principal was scared of Makima that he piss his pants. He immediately give Izuku the card.
He goes back to his class and slapped the teacher and he showed him the card. All of the students widen their eyes when they find out about the card.
Now, no one dares to touch Izuku.
End