The popular housewife Nao is also married and lives with her husband and father-in-law, who require care. However, Nao's past is a secret to her strict father-in-law, who hates the water industry. One day, knowing Nao's past, her father-in-law abuses her, begins sexually harassing her, and even forces himself on her. Nao is at a loss and becomes a captive of her father-in-law, who is so different from her husband.