Agari Kamiya, the school's top player, comes across a shy transfer student named Koyori Tsumujikaze, who shows an interest in joining the table tennis club. Having a practice match against her, Agari is surprised by how skilled Koyori seems to be. Koyori plays against the other club members, quickly rising up the club's ranking after beating ten first-year members in a row. As Koyori is revealed to have been a prefectural semifinalist in her previous school, Agari becomes anxious that her position as the club's ace will be taken from her.
Agari uses her loop drive technique to gain an early lead against Koyori. However, Koyuri becomes excited and starts countering Koyori's backhand smashes, expressing her love for table tennis.
Noticing that the rubber on Koyori's paddle has worn off, affecting her play, Hokuto suggests that she buy some replacements, only to find she has no allowance. To this end, Koyori starts working part-time at Hokuto's family table tennis store alongside Hanabi in order to earn money for new rubbers. While trying to work up the courage to deal with customers, Koyori ends up serving a rather peculiar customer.
Koyori continues to struggle against Kururi's curve drives, which keeps causing the balls to swerve off the table. Despite falling behind two games, Koyori remains excited and determined to make Kururi feel the same excitement.
While setting off for a training camp, the girls come across Kumami Tsukinowa, a former teammate who appears to have a history with Agari. Later, as the camp gets underway, Agari, who is worried about her skills after narrowly beating Zakuro, struggles with hitting lethal smashes.
On the final day of the training camp, Agari and Koyori spend some time teaching some of their underclassmen, which soon attracts attention and turns into a late night tournament.