Seiji (played by Takeuchi) grew up as an orphan who was raised by Boss Muto. The Muto family is composed only of Boss Muto, Seiji and Yoshi and serves as a branch of the larger Date family. When Muto is called upon to settle his dues to the gang, he instead vows to assassinate a top officer of the rival Tendo family. Seiji offers to carry out the assassination himself but Muto forbids it, as Seiji already served a 15 year murder sentence for a gang related hit. A day later, Muto is arrested for possession of an illegal firearm and sentenced to serve 2 years in prison.