Ookiku Furikabutte: Kihon no Kihon

Before Ren Mihashi arrives at Nishiura High, Musashino High's baseball club is already struggling with its own problems. Pitcher Naoto Kaguyama becomes uneasy when first-year Motoki Haruna joins the team and immediately displays a level of dedication and ability that could take Kaguyama's place on the mound.

Rather than simply resent the newcomer, Kaguyama begins trying to understand why a talented pitcher like Haruna chose an unremarkable school. Their uneasy relationship pushes Musashino to reconsider its ambitions and the fundamentals needed to become a team worthy of serious competition.