A married Japanese forester during WWII is sent to Indochina to manage forests. He meets a young Japanese typist and promises to leave his wife. He doesn't and after the war, she turns up and the affair resumes.

Shuhei Hirayama is a widower with a 24-year-old daughter. Gradually, he comes to realize that she should not be obliged to look after him for the rest of his life, so he arranges a marriage for her.

A nameless ronin, or samurai with no master, enters a small village in feudal Japan where two rival businessmen are struggling for control of the local gambling trade. Taking the name Sanjuro Kuwabatake, the ronin convinces both silk merchant Tazaemon and sake merchant Tokuemon to hire him as a personal bodyguard, then artfully sets in motion a full-scale gang war between the two ambitious and unscrupulous men.

Kanji Watanabe is a middle-aged man who has worked in the same monotonous bureaucratic position for decades. Learning he has cancer, he starts to look for the meaning of his life.

Keiko, whom everyone calls Mama, narrates her story: she's a hostess on the Ginza, 30, a widow. She describes life's vicious cycle: acting cheerful around drunks, dressing and living well to convey confidence, needing money for these expenses and for her demanding mother and brother, and knowing she's growing older.

Through an ingenious use of camera and flashbacks, this movie reveals the complexities of human nature as four people recount different versions of the story of a man's murder and the rape of his wife.