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.