The Pursuit of Happiness (1988)

The Pursuit of Happiness 1988 / うれしはずかし物語 1988 / A Tale of Happiness , A Story of Lovers , Ureshi Hazukashi Monogatari

Bored with their marriage, a middle-aged husband and wife each take on a lover half their age. Yusuke Mikuni, a department manager at his company, buys a one-room apartment to have some space for himself. He signs an agreement with a young woman named Chako and has an affair with her once a week at the apartment. (Source: IMDb & TMDb)