He Killed Dad.

The lives of two brothers, Kunio and Akira Kasahara, are changed forever when their father is murdered. Kunio sets out on a manhunt to avenge his father and will stop at nothing until he finds the killer. Setsuko, Kunio's fiancée, is unable to keep up with the lunacy that Kunio stirs up and finds comfort with another man - his brother, Akira.