"It all started when I found out my husband was cheating on me."Rumiko Kawagoe, 40, is married for 15 years this year and is the mother of two children. During her school days, Rumiko was a model student, so serious and responsible that she was elected student council president in the school election. Rumiko is a beautiful and refined wife who seems to have no connection to AV, but the X-day that led to this incident suddenly came one day. She found out her husband was cheating on her. "When I saw him desperately trying to make nonsensical excuses that she was just a sex friend and not a lover, I lost interest in him all at once...But more than the shock of being betrayed, when I realized that my husband, who I thought was serious, had this kind of true nature, I felt a sudden relaxation and lightness in my shoulders." This submissive wife, who had been expected to be an honor student and suppressed for her entire life, finally releases her desires by making a pact with a stranger.