Mai Hanano, who has entered into a secret relationship with her father-in-law. On nights when her husband is away, she deepens her physical affair with him. Once she discovers the pleasure, she is plunged into even greater torment within the confines of family bonds. Married into the family as the elder brother's wife, she becomes entangled with her father-in-law without her husband's knowledge. However, this secret is uncovered by her husband's younger brothers, bringing new terror into her daily life. Subjected to daily repeated humiliations, she can do nothing but bow her head again and again in a desperate attempt to preserve her position within the family.