mumu-chan, who is in love with her gym teacher, Mr. Yamashita, takes initiative and sucks his cock in the gym storage room. Unfortunately, the vice-principal sees them. Later, Mr. Suzuki is blackmailed by the vice-principal and calls mumu-chan after school for so-called guidance, where she is forced to do sexual acts. Unable to refuse due to her weakness, mumu-chan complies with the vice-principal's demands. A shocking truth is revealed—mumu-chan is a boyish girl! When her pants are removed, her clit-cock is rock hard in front of her beloved Mr. Yamashita. From there, the two teachers make her cum repeatedly with various acts. On another day, she is called to the nurse's office, given strange medicine, restrained, and subjected to intense M-training with various toys, making her feel and cum non-stop. Ever since that day, she has become the complete slave of the two teachers.
