Kageki

Kageki is the man who accidently killed Shikazo and Katazu's twin brother. Kageki had loaned money to Shikazo one time and after the birth of his child, he needed the money and asked Shikazo if he can be repaid but he refuses. After a small scuffle, Shikazo falls and hits his head on a pickling stone that was hard enough to kill him. Since then, Kageki and his family went into hiding while Katazu took his identity and got the attention of his pursuers.