Aimi lived with her husband and her father-in-law who needed nursing care. One day when peaceful daily life continued, her husband became a person who did not return due to an accident while sheltering Aimi. Then I started living with my father-in-law, but the loneliness of losing my son distorts my father-in-law's personality. The hidden metamorphosis was also exposed, and Aimi was gradually eroded by the runaway of her father-in-law's sex.