After a fallout on his previous volleyball team in Tokyo, skilled setter Kimichika Haijima returns to Fukui. Reconnecting with his childhood friend, Yuni Kuroba, Haijima sees untapped potential in him. Determined to create a strong team, Haijima persuades Kuroba to join him in forming a new volleyball squad. However, during the prefectural tournament, Kuroba struggles under pressure, leading to their team's defeat and a rift between the two friends. Now at Seiin High School, both Haijima and Kuroba reunite on the volleyball team. This time, Haijima guides Kuroba to overcome his fears and excel as the team's ace, aiming for victory in the prefecturals alongside team veterans Oda and Aoki. As they face the formidable Fukuho Technical High School, the reigning champions, the team must conquer internal and external challenges to secure a spot at the Spring Tournament. Can Haijima and his teammates break their cycle of defeat and emerge as champions?