After becoming a stepmother, Ryouko lived happily with her husband's son, Tatsuya, building a peaceful family life. However, one year after her husband left for an overseas business trip, just as she was growing accustomed to living alone with Tatsuya, he suddenly demanded her underwear, leaving her shocked. Yielding to his intense insistence and suppressing her shame, she ended up stripping off her underwear right there and handing it over. A few days later, Tatsuya's malicious friend slandered Ryouko and forced her into humiliating acts in front of Tatsuya. This incident was only the beginning of a tragic descent...