Karasuno High gains an unexpected addition midway through the school year—a second-year transfer student invited by faculty to become the boys' volleyball team's new manager. With Kiyoko preparing to graduate and the team needing another dependable pair of hands, the opportunity couldn't have come at a better time. The team welcomes their newest manager with varying levels of excitement, curiosity, and awkwardness. Among them, third-year setter Sugawara Koushi is the first to make sure the transfer student never feels out of place. What begins as simple teamwork gradually turns into shared smiles, late practices, quiet walks home, and a bond neither of them expected.