Yuu Tono is a second-year student at Kazami Academy and a hyper-realist who has decided that youth is not something worth chasing. While his classmates pursue activities and experiences, Yuu devotes his time to his part-time job and treats schoolwork as a logistics problem to be solved efficiently. Two people refuse to accept this. Hibiki, his childhood friend, pushes him toward the AcTive club — an energetic group with the motto of enjoying youth and having fun. Riri, a classmate who treats Yuu as a mentor, recruits for the NegaTive volunteer collective — diligent students dedicated to making the world a better place on their own time. Both clubs pursue him relentlessly. Yuu wants neither. The story is about what kind of youth finds him anyway, despite everything.