Takashi spends most of his part-time job earnings on sex. He goes to a mature soapland with great enthusiasm, but when the door opens, his mother, Chisato, appears to be his partner. Takashi is surprised, but when he finds out that his mother is the No. 1 at the store, he is instantly captivated by her techniques. His mother, Chisato, then performs the ultimate soapland play on her son.