Mao, who was interested in the life of the janitor she admired, forcibly enters his house... and suddenly, the man she admires loudly confesses his love to her. Mao is confused by the unexpected confession, but she is drawn to the gap and gives in to him. A few days later, when Mao visits the apartment again, feeling like a lover, she is attacked by a large number of adults who are waiting for her with evil plans... A forbidden love affair after school, in which she becomes the man's toy.