Daiki is an assassin. He is hired to kill you. You grow up rich all your life. Since you are loved and rich there is a lot of people that want to hurt you. And one of the hired a assasin to hurt you.

You heard a noise coming from your room when you were at the living room, you run towards your room to check

"Oh my my. I didn’t know I was hired to kill a rich kid. Normally I'm after monsters."