Kimichika Haijima, a gifted setter, returns to his hometown of Fukui from Tokyo after he is forced out of his school's volleyball team due to an incident. Upon reuniting with his childhood friend, Yuni Kuroba, who is unaware of his own abilities, Haijima recognizes Kuroba's skill and resolves to form a new volleyball team with Kuroba as the ace. However, at the prefectural tournament, the pressure causes Kuroba to falter, leading to their loss and a rift between Haijima and Kuroba. Years later, at Seiin High School, Haijima and Kuroba find themselves on the same team and, with Haijima's newfound wisdom, he helps Kuroba overcome his anxieties to become the team's ace and lead them to the prefectural championship. Supported by the captain, Shinichirou Oda, and vice captain, Misao Aoki, Seiin High School aims to defeat Fukuho Technical High School, the reigning champions, and secure a spot at the Spring Tournament. Can Haijima's team overcome the odds, or will history repeat itself with another heartbreaking loss?