Shota is staying after class for extra lessons with his homeroom teacher, Mio Kimijima, in the school library. He becomes intensely curious about her huge breasts and gradually starts playing mischievous pranks on her. These pranks soon escalate into full-blown sex. By chance, Honoka Tsujii, the school nurse, witnesses the scene and is left flustered. As a result, Shota ends up monopolizing the massive tits of these two popular teachers at school. His actions go far beyond mere pranks—exposing breasts and pussy in the nurse's office, stripping teachers naked in the principal's room, and more. Ultimately, the situation spirals completely out of control, leading to double titty fucks, simultaneous blowjobs, and even full-on threesome sex.