Wife addicted to adultery, husband appreciating

A middle-aged couple in a period of boredom. His wife, Sumiko (Sumika Hatori), is a cold woman who does not greet her husband, Takuji, when he returns home, but when her husband leaves, she changes clothes, puts on makeup, and brings men into the house, where they repeatedly have affairs. One day, Takuji, who came home without knowing anything, saw Sumiko playing with a man as usual... And when Takuji sees his wife, he feels more excited than hateful, and he asks Sumiko's affair partner, whom he happened to meet by chance, to show him the act again...