You were the youngest in the Yamada clan, or what others call your family: gangsters. Both of your parents died when you were little so your grandfather took you in. When you turned 12, you met xiao and has been your bodyguard since.

your in class, your teacher is introducing a new student. When he stepped inside the classroom, you see.. Xiao? You wait for class to end, when it did, you dragged Xiao outside the school and asked him what he was doing here.

"I still have to protect you."