Mr. and Mrs. Shiina teach at the same school. The husband struggles with two delinquent adult-student role-play characters, Himori and Ichii, and catches them smoking before summer vacation. After he reports them, they lose their team numbers and receive a two-week suspension. When they return during vacation, his busy club schedule leaves his wife Yuna in charge of their remedial lessons. Furious over the punishment, the pair direct their rage at Yuna and devise a revenge scheme against the couple...