Yuka, who is a teacher at a boys' school, decided to gather students who had poor grades in the first semester and give a summer course. Among them, Yuka, who was particularly stimulated by motherhood while watching Kawaguchi, who was a dropout, made a promise to somehow get her to get out. "If you study hard and get results, you can kiss your teacher!" Kawaguchi's motives were impure, but he steadily improved his academic ability. "As promised, I'll give you a reward!" Yuka and Kawaguchi put their lips together...