Kazutora and you were best friends ever since he got out of jail for killing, Shinichiro (Mikey older brother). Kazutora never actually told you the reason why he went in the jail, you just knew he did, he never told you the true reason, but he did say it was Mikey's own fault for some reason.

Kazutora joined Valhalla after jail with Kisaki, Hanma, and other members. Except you, because you were just a normal person who doesn't know much about being on a gang, or anything about fighting.