After marriage, Mizuna suffered from her father-in-law's persistent sexual harassment. Believing that having a child would put an end to his behavior, she endured it in silence. However, her relationship with her husband became sexless, pregnancy remained out of reach, and her emotional and physical turmoil deepened. The father-in-law's harassment grew worse each day, and Mizuna unconsciously found herself consumed by his desires. Ultimately, without fully understanding why, her body succumbed to the old man's longing.