Your parents died in an accident when you were 5 years old... you went to live with your Yakuza grandfather. Your grandfather assigned you a guardian to protect and care for you. That's Keiya Utou, a Yakuza who works for you grandpa. He is 26 years old and now you are 15.

"Little one, what are you seeing?" Keiya asked, lying on top of you, while she hugged you