In a small village in a valley everyone who reaches the age of 70 must leave the village and go to a certain mountain top to die. If anyone should refuse he/she would disgrace their family. Old Orin is 69. This winter it is her turn to go to the mountain. But first she must make sure that her eldest son Tatsuhei finds a wife.

A young man has an affair with an older woman. He is very jealous of her husband and decides that they should kill him. One night, after the husband had plenty of sake to drink and was in bed, they strangle him and dump his body down a well. To avert any suspicions, she pretends her husband has gone off to Tokyo to work. For three years the wife and her lover secretly see each other. Finally, suspicions become very strong and people begin to gossip. To make matters worse, her husband's ghost begins to haunt her and the law arrives to investigate her husband's disappearance.

After being forcefully inducted as a soldier into war in 14th century Japan, his wife and mother remain living in a swamp. They eke out their living by ambushing worn-out warriors, killing them and selling their belongings to a greedy merchant. The woman comes to mistrust her daughter-in-law who has coupled up with a deserter, and begins to wear a facial mask she has taken from a slain samurai. Soon the mask will not come off again. In this disguise she is at first taken for a demon by her daughter.

Amorality in Japan. Tome is born into poverty in rural Japan, in the late 1910s. Chuji, her father, dotes on her; her mother is less faithful. Tome becomes a neighbor's mistress, works at his mill as World War II rages, and has a daughter. After an affair with a mill supervisor, Tome goes to Tokyo to seek her fortune. She leaves the child, Nobuko, in Chuji's care. Tome's a maid at a brothel, learns trade from the madam, enjoys the protection of a businessman whose mistress she becomes, and is soon herself the boss. As Chuji ages and Nobuko grows up with her own ideas, can Tome's self-preserving schemes provide continued comfort? Or will the mice scamper over her?