Would this make an interesting story of an anime/manga?

His name is Kane Sunog.

He had a traumatic experience when he was a kid. An experience that affected him for the rest of his life.

Kane was a polite and cheerful boy, had many friends and was kinda the prankster type.

He has high grades at school and physically fit. He had a little sister named Nia, he was like the perfect older brother towards her.

When he was about 12 years old, that said experience happened. When he was about to go to his sister's room to borrow something, he saw something strange. He saw blood at the doorsteps of his little sister's room.

As he peeked through the door, he saw his sister being tortured and all his relatives covered in blood and decapitated. Once he got a closer look, he saw that the killers where his own parents.

He went to his dad's room and grabbed the gun in the closet. He went back to his sister's room and shot both his parents. He heard his sister's last words say:"o...oniichan", then she died of blood loss.

Ever since then, he became more emo and more of a loner. He lost his sense of fun and became wiser than before, yet he still continued his studies.

He decided to take martial arts and used his negative energy to his own advantage. Eventually, he surpassed human limits and became kinda like a "hero" by helping others when they are bullied, raped,get hit by a moving vehicle, etc.

That's it, that is his story. But that is only a flashback, the main storyline is mostly focused on comedy, action and romance.

(Here is a link if the pic is too small: link )