Yuzu and Mei were caught together by Sayaka, a junior member of the student council. Suspected of being in a romantic relationship, Yuzu was asked to leave the academy as a disruptive presence. However, Yuzu faced the situation head-on and managed to draw out the feelings hidden deep within Sayaka's heart. Through overcoming challenges together with Mei, they felt a new bond forming. Meanwhile, Matsuri, troubled by her inability to support them, stopped showing up at school. Worried, Harumi decided to visit Matsuri's home... With each character holding their own feelings, an irreplaceable summer begins with this group.