On her first day at Nishi High School, 15‑year‑old Hiromi Oka is inspired to take up tennis by the school’s top player, Reika “Ochoufujin” Ryuuzaki. After joining the tennis club, she meets its new coach, Jin Munakata, who subjects everyone to an intense training regimen that even surpasses Ochoufujin’s standards. Despite the hardships, Hiromi’s determination convinces Munakata to include her in the club’s main lineup, forcing her to confront the pressure from senior players to become an ace.