Reika Ross, also known as Reika Ryūzaki and nicknamed "Ochōfujin" (Butterfly Noblewoman), serves as the top tennis player at Nishi High School. Her exceptional skills and prominent status inspire first-year student Hiromi Oka to join the tennis club. As a senior player, Reika encounters rigorous training under new coach Jin Munakata, pushing her established capabilities to their limits. Despite these challenges, she retains her position as a leading player on the team. Reika's presence and performance set a demanding standard for club members, fueling the competitive environment that drives the team’s development.