Big-titted female teacher Hitomura accidentally discovers two female students engaging in lesbian sex in the gym equipment room, causing her to become aroused and indulge in masturbation. Her act is spotted by another student, throwing her into further confusion. Several days later, the same student—who previously claimed to only be interested in women—peeks in on her again, joins her, restrains her, and launches a lesbian assault. Hitomura is repeatedly tormented and forced to orgasm using a vibrator and a roarer. The scene of her being involved in lesbian acts with schoolgirls continues to repeat.