Satomi, a wife, lives with her husband and her father-in-law, who sexually harasses her on a daily basis. One day, Satomi, whose husband is busy and frustrated, finds her father-in-law's porn magazine and becomes excited and starts masturbating. However, her father-in-law sees her doing so! Satomi desperately denies her frustration, trying not to show her weakness, but her father-in-law tells her, "If you're not really frustrated, wear this," and makes her wear a chastity belt, beginning to control her sexual desire. As Satomi continues to be teased and frustrated while caring for her father-in-law, she eventually accepts her own perversion and begs for her father-in-law's old man dick, which she hated so much...