Mamakondo youth Kazuo, who always pleasures himself while thinking of his mother. One day, he discovers that his mother, Mitsu, actually works as a soap girl. Shaken and confused, Kazuo's feelings for his mother grow stronger than ever, driving him to visit the soap shop where she works. As he spends time with her and becomes curious about the hidden side of her job, new desires awaken within him. Yet he continues to struggle with how he should handle his relationship with his mother.