Taiki Inomata is a first-year student at Eimei Academy, a private school known for its competitive sports programs. As a member of the badminton team, he dedicates himself to early morning practices, yet no matter how early he arrives at the gymnasium, he always finds the girls basketball team already there. The person always ahead of him is Chinatsu Kano, a second-year student and the star of the basketball team, for whom Taiki has developed a deep crush. Despite the gap in their social standing and athletic recognition, Taikis feelings grow as he watches her relentless dedication to the sport.

Their dynamic takes an unexpected turn when Chinatsu’s parents move abroad for work, leaving her unable to stay alone. Because their mothers were former basketball teammates, Chinatsu is invited to live with Taikis family. Under the same roof, Taiki vows to become worthy of her by pursuing the same dream that drives her: reaching the national championships. He intensifies his training, hoping to build a meaningful connection with his new housemate while navigating the awkwardness and quiet intimacy of sharing a home.

The story is set at Eimei Academy, an integrated middle and high school where multiple sports clubs practice simultaneously in the same gymnasium. This setting forces constant interaction between athletes from different disciplines, particularly badminton, basketball, and rhythmic gymnastics. The location is modeled after a real high school in Saitama Prefecture, and the schools demanding athletic culture forms the backdrop for characters striving to balance rigorous training with personal relationships.

Taiki Inomata is a determined but self-doubting freshman who works tirelessly to earn a spot as a regular on the badminton team. His quiet perseverance and genuine nature make him easy to root for as he navigates both competitive pressure and romantic uncertainty. Chinatsu Kano is a reserved and focused athlete whose passion for basketball sometimes masks her emotional vulnerability. Living with Taiki allows her to open up gradually, revealing layers beyond her composed exterior. Hina Chono, a childhood friend of Taiki and a member of the rhythmic gymnastics team, becomes a key figure when she realizes her own feelings for him, setting up a nuanced love triangle. Kyo Kasahara, Taikis best friend and fellow badminton club member, provides steady advice and perspective, often acting as the voice of reason. Other important figures include Kengo Haryu, the top male athlete on the badminton team who takes Taiki under his wing, and Ayame Moriya, a manager who joins the badminton club and becomes involved in the romantic tensions among the group.

The first season unfolds across several narrative arcs that blend sports competition with emotional development. The Regulars Arc establishes the premise of Taiki and Chinatsu living together while Taiki works to secure a position on the badminton team. In the Regional Preliminaries Arc, Taiki is paired with Haryu for doubles, and their partnership helps elevate Taikis skills while bringing him closer to Chinatsu. The Prefectural Qualifiers Arc introduces Sajikawa High School as a formidable rival and sees Hina confronting her growing feelings for Taiki after learning about his living situation. The Fireworks Festival Arc centers on a summer festival date between Taiki and Hina, which creates complications when Chinatsu learns of it, leading to unresolved tension as national tournaments approach. The Nationals Arc follows Chinatsu and Haryu as they compete at the national level, with Taiki attending to support them and grappling with his own feelings of inadequacy. The Cultural Festival Arc and Autumn Training Camp Arc deepen the romantic entanglements, culminating in a Confession Arc where long-simmering emotions come to a head. The season concludes with the Relationship Beginnings Arc, which marks a significant shift in Taiki and Chinatsus dynamic as they plan their first real date together. The first season covers approximately the first eighty chapters of the source material, ending at a turning point that sets the stage for the announced second season.