Akane Tachibana is a 15-year-old Kouzu High student who joins the basketball club as a power forward. Standing 173 cm tall with blood type O, he abandoned basketball due to overwhelming pressure despite his innate talent. His passion reignites upon discovering his rival, Hitonari Hiiragi, attends the same school.

Living with his mother, Tachibana habitually drinks flavored milk to increase his height—a quirk offset by his athletic prowess in dunking and dribbling. He communicates with unfiltered bluntness and uses the unconventional catchphrase "Atchoo" during critical game moments to sharpen focus.

His complex history with basketball includes quitting pre-high school under external pressures. At Kouzu, he actively recruits teammates: persuading Akihiko Harumoto by addressing Harumoto's guilt over a friend's injury, and challenging captain Yoshiki Yamazaki at a supply store to overcome a knee injury.

Tachibana's rivalry with Hiiragi evolves from friction to cooperation when forced to partner on Kouzu's team. During an exhibition game against Hyamazaki—coached by Hiiragi's father and featuring his brother Takuya—a teammate's provocation unites them. Their combined skills inspire victory, cementing Tachibana’s grasp of teamwork.

Beyond gameplay, he catalyzes emotional breakthroughs for teammates confronting insecurities and trauma. His straightforwardness fosters group authenticity. The narrative charts his growth from a pressured talent to a team-centric player dedicated to collective triumph.