The narrative revolves around Tenjin, a 27-year-old school teacher who specializes in preparing students for entrance exams to high schools and middle schools. Despite his proficiency in teaching young children, he harbors no affection towards them. He merely endures his job while mentoring JD and navigating life's tumultuous waters. However, during a fifth-grade class session, one of his pupils embraces him tightly and declares her love for him. This is witnessed by Seika, a 14-year-old middle school student, who coerces Tenjin into providing her with "private lessons" at night.