A woman, Tome, is born to a lower class family in Japan in 1918. The title refers to an insect, repeating its mistakes, as in an infinite circle. Imamura, with this metaphor, introduces the life of Tome, who keeps trying to change her poor life.

Mako and her girl friends enter a dispute with rival street gangsters The Eagles, a band of racist macho pigs led by the evil Baron, who hate half-breeds. When one of the girls start dating a half-breed, they start a terror campaign to take all of them out of town. Mako and her gang fight back, helping their new friend Kazuma find his long gone sister.

A silk factory worker is persuaded to support her son's education up to a college level despite their poverty. Many years later, she travels to Tokyo to visit her son.

Saheji, a man-about-town, gets stuck at a high-class brothel when he can’t pay the bill. He makes the best of his situation by performing various tasks amidst the tumult of the end of the shogunate—but always by making sure to get a “commission” for his troubles.