Two teenage friends conspire to find out how much their youthful sensuality can disrupt one of their households, headed by a dentist and his mentally-ill wife.

Yuko is an innocent high school girl who has a crush on her gym teacher. She and her friends have a sleep-over party which develops into a sexual dare-game involving eels, and a lesbian orgy. Now sexually-awakened, Yuko decides to seduce her teacher, but is raped in an elevator before she meets her teacher.

Kyōko is a woman with a promiscuous past who is sexually unsatisfied with her marriage. Her frustrations lead her to have hedonistic dreams, such as her mother and grandfather having sex together. Seeking to rejuvenate her marriage, she throws a wild party. The ploy is a success.

Yukie is a young woman who works at her father's flower shop. She uses her job to hide from her problems including a marriage troubled by her sexual frigidity. Her husband and her best friend engage in an affair, and Yukie goes to her father for advice on how to save her marriage.

Saeko is abnormally attached to her older sister, Yumi. When Yumi becomes engaged to Arikawa, Saeko schemes to separate the two. She seduces Arikawa who then becomes confused over his attraction to both sisters.