Nanaho takes on the responsibility of caring for her father-in-law to alleviate financial hardship, but what is demanded of her is an abnormal form of caregiving. Meals involve tasting food inside his mouth and using her tongue during deep kisses to assist with chewing, while sponge baths require meticulous full-body care using only her lips. On top of this, she is forced to deal with the rigid arousal of the elderly man in a cruel and degrading manner. A shocking story of a young bride drawn into an illicit relationship within the household under the guise of caregiving.