Young entrepreneur Omatsu is buried in work when Mai, a housekeeper hired without his knowledge by a subordinate, arrives at his home. He reluctantly lets her in, but while cleaning she deliberately sticks out her ass and teases him. Claiming she wants to massage away his exhaustion, she presses her body tightly against his. The sudden seduction leaves Omatsu confused, but he cannot stop himself from getting rock hard. When Mai notices, she flashes a wickedly lustful smile and slowly reaches for his crotch—the first glimpse of the dominant, insatiable woman hiding beneath her ordinary exterior.