Mizuki Hijiri, is a high school girl who just transferred schools. At her new school, she has a fateful encounter with boys suffering from chuunibyou (adolescent delusions of grandeur). There is Noda who dreams of becoming a hero, the tragically handsome otaku Takashima who only likes 2D girls, Nakamura the supposedly "reincarnated" angel or devil (he can't decide which), and the self-professed string-puller Tsukumo.

Once called a fallen powerhouse and known as "Flightless Crows," Karasuno High School has finally taken flight at nationals. With a comprehensive performance against Tsubakihara Academy in their first match, the team is now facing its toughest opponent yet: the runners-up of the last Spring Tournament, Inarizaki High School. Furthermore, dealing with the formidable twin Miya brothers only makes things more difficult for Karasuno. As soon as the match begins, Karasuno is overwhelmed by all the noise and jeers from the supporters of Inarizaki High but rekindles its strength thanks to its own loyal fans. Karasuno also gains some momentum by utilizing an attack centered on Shouyou Hinata, but the eccentric play of Atsumu and Osamu Miya delivers an unexpected blow that leaves their opponent astounded. Things are bound to get intense as the match progresses between these two teams. Will Karasuno be able to defeat Inarizaki High and overcome the hurdles that threaten its pursuit to the top?

Kakeru, a former elite runner at high school, is chased for stealing food. He is saved by Kansei University student Haiji, who is also a runner. Haiji persuades Kakeru to live in the old apartment "Chikuseisou" where he plans to team up with fellow residents to enter Hakone Ekiden Marathon, one of the most prominent university races in Japan. Kakeru soon finds out that all of the residents except for Haiji and himself are complete novices.