The Yanagida couple haven't had sex in over a year due to the husband's hernia. Yayoi is a youthful yet passionate wife, constantly struggling with intense sexual desires. With her relationship with her husband stagnant, she copes by masturbating daily. One day, the shower in her apartment breaks down, forcing her to use the manager's shower. This situation proves to be like a moth drawn to flame. The lewd apartment manager takes advantage of her vulnerability, aggressively pleasuring her against her will. Though she verbally resists with "I don't want this," her body instinctively responds, and she's swept into an unexpected and overwhelming experience.