Daigou Inokuma attended university alongside Shunsuke Hongo, forging their friendship while pursuing different athletic paths; Hongo played baseball while Inokuma competed on the volleyball team. His father's death sparked an intense fixation on volleyball, leading Inokuma to dedicate himself entirely to the sport. This obsessive training regimen resulted in a devastating injury to his right wrist. The damage proved irreparable, permanently ending his competitive volleyball career.