An unwanted presence suddenly intrudes on an otherwise happy marriage. Narimasu, a filthy and vulgar middle-aged neighbor, disgusts Mayu from the moment he rubs his face against her hand. Later, while her husband is away, he talks his way inside for one drink, drugs her, molests her unconscious body, and takes photos before leaving. She tells herself he is revolting and despicable, yet the next morning she finds her own fingers sliding between her legs.