A 40-year-old married woman named Amamiya Tsukasa finds herself alone at home while her husband, the manager of a major insurance company, goes golfing and drinking every weekend, and their teenage son is deeply involved in soccer club activities. Feeling lonely and bored most of the time, she starts exploring her own desires through masturbation. As she continues, she becomes more aware of her hidden infidelity fantasies growing stronger inside her. After years of suppressing her true self for the sake of being a good wife and mother, Amamiya finally decides to let go and embrace her carnal side - a decision that leads to a series of intimate encounters captured on camera. Note: Content may vary depending on the recording method used.