Youth suspense story where Ren Ozawa, who appeared on various popular stages and acted as a variety program and voice actor, serves as a high school teacher for the first time. An incident occurred on Valentine's Day when a student died due to poisoned chocolate. The teacher, Nishina (Ozawa), who is cold and ridiculed by students, tries to unravel the truth
Kondo Isami, a third-year high school student, has good grades but he is forced to decide which path to take because of his family’s financial situation. One day, he learns about the government-affiliated Defence Academy where students are not only exempt from admission fees and school fees, but are given an allowance every month.
Higashigaoka High School’s male swimming club presently has only three second-year members – leader Sakaki Shuhei, Shinozuka Daiki and Koganei Haruyoshi. They welcome the new school year with the aim of getting members.