After her husband, Yuuichi, took over his family's business, Yuki began living with his parents. Yuuichi's mother, Ikue, deeply doted on her son and treated Yuki with cold harshness. However, witnessing Yuki's constant devotion to supporting Yuuichi, her father-in-law, Taro, began harboring intense desires toward her. One day, while Yuuichi and Ikue were out, Taro slipped into the room where Yuki was alone and took unexpected, forceful action. From that moment on, Taro became obsessively fixated on Yuki, repeatedly groping and molesting her even in Ikue's presence, leaving Yuki to endure each day in fear and confusion.