Sora Kurumatani has a deep passion for basketball, but his height is far below that of most players. Nevertheless, he remains convinced that determination and persistent practice can make up for his short stature.
Following his mother's hopes, Sora enrolls at Kuzuryuu High School intending to join the basketball club and compete in games. When he gets there, however, he discovers that the boys' basketball team is a laid-back group more focused on hanging out than on serious play. He also becomes friends with the Hanazono brothers, Chiaki and Momoharu, who have lost their former drive for the sport.
To spark the team's enthusiasm once more, Sora challenges them, demonstrating his quick agility and nimble playing style that outmatches them. Seeing Sora's impressive skill, steadfast dedication, and pure love for basketball, the boys reignite their own forgotten passion for the game.