Saeko, a modest mother with no interest in fashion, always ignored her son Hiroshi's attempts to discuss style. One day, while sorting laundry, she discovers an unfamiliar, provocative swimsuit and, out of curiosity, decides to try it on. The swimsuit is made of extremely thin fabric—something she would never normally wear. As Saeko sees her own shamelessly erotic appearance, she becomes overwhelmed and begins masturbating right there. Suddenly, Hiroshi walks in, embraces the swimsuit-clad Saeko tightly, and excitedly tells her, "Mom, you looked so beautiful and sexy."