After her husband was laid off and they were forced out of their company housing, Anmitsu moved in with her father-in-law to support her husband's job search. One day, she caught him washing a urine bottle in the kitchen and scolded her harshly. But he wasn't satisfied with just scolding—he lifted her skirt, forcefully slapping her back repeatedly. Though shocked by the pain, Anmitsu found her latent masochistic desires awakened, her expression drifting into blissful arousal. Sensing his daughter-in-law's hidden fetish, the father-in-law gave in to his own uncontrollable lust. A new storm of forbidden emotions begins to swirl within the quiet household.