Light for an Angel

This is an original story with original characters so they belong to me. If you want to use the characters or storyline just ask I really have no problems but I would like credit to be given. Ok so the description:

Raito kills, but he hates it, hates living he's not pure he's a sinner, worthless, a pest. He grew up in violence neglected by society tarnished and broken at the ripe age of 6 and a half. He just wants to be pure and rid the world of the demons that hide among us.
"This world is filled with poison, disgusting lumps of flesh that take and destroy without a thought towards the other's who share this world. Filled with people who cheat and scheme to better their lives while fucking over the rest of us. And those who take another's life without a second thought...I take lives, I am a sinner a monster just like the rest of these pathetic souls. But I unlike them do it for the betterment of the pure, those who have the toughest time living because the world screws them over. I will rid this world of evil with my bare hands because no one else will, I will do what others are to weak to do. Now I ask you...what kind of sinner are you?"
He's given up on the world focused only on ridding it of the sinners, but what happens when he meets a boy who gives his life new meaning and a new purpose.
"I'm really sorry for staring but you looked cold I hope you don't mind me staying here with you until the rain stop's."

(Note's: it's genera is a fanfiction for now but that will change after I develop the story a bit more. And this might have sexual content in it but like a lot later in the story, also guyxguy don't like it then there's a door- 👉🚪)