Wakaba lives with her husband, her frail father-in-law, and Yamajii. One day, Wakaba breaks her father-in-law's treasured bonsai tree and tries to cover it up. Yamajii, a former investigator, deduces that Wakaba is the culprit and interrogates her. Wakaba's father-in-law is furious at her for concealing the truth, but his anger turns to sexual desire when he sees her youthful, voluptuous body, and so begins his sinister, erotic punishment...