Haijima Koshi (voiced by Kensho Ono) is a young man who has devoted all his passion to the sport of volleyball. However, his excessive seriousness led to an accident, forcing Haijima to bid farewell to Tokyo and move back to his hometown of Fukui to start a new life. In Fukui, Haijima's childhood sweetheart Kuroba Yujin (voiced by Junya Enoki) lives. When Kuroba learned that his childhood friend was about to return, he was full of excitement. However, Haijima's personality has long been different from before, and a series of events have led to the breakdown of the friendship between Haijima and Kuroba. In the second year, Haijima was promoted to a local high school and naturally joined the school's volleyball team. Here, he met the petite but passionate captain Shinichiro Oda (voiced by Kento Ito) and his partner, the venomous deputy general Aoki So (voiced by Yuichiro Umehara).