Michiko and Yoshiko would seduce men on the train, rape them, and then use that to extort money from them. Kitajima has not been able to forget Michiko since he raped her. Yoshiko is Michiko's younger sister, but she has not yet known a man and adores Michiko as a lover. One day, an unexpected incident occurs when Michiko steals an unreleased floppy disk from a middle-aged man...

A man dreams of groping women on the train. He then leaves his girlfriend and moves to Tokyo. After getting bullied by a group of men, a master trains him in the ways of groping.

Three years have passed since Sonoyama married Akiko. Akiko was a virgin, but she was trained by Sonoyama and has now become a ripe woman. Sonoyama has a strong sexual desire and has another mistress named Michiko. One night, he goes to a swapping party at Michiko's urging, and they exchange partners and indulge in an affair, pretending to be married. However, a year later, the couple moves in next door...