Yuzu is dedicating her days to studying for exams with the goal of having a birthday party. However, due to scheduling conflicts with her mom and Mei, the party gets postponed. To cheer up the downcast Yuzu, Harumi suggests a mini-party. Meanwhile, Mei notices something off about Yuzu and consults with Himiko to plan a surprise gift for her on her birthday. During summer vacation, Matsuri, who has too much free time, encounters Mei choosing a birthday present for Yuzu while out. She is asked for advice, but... Each of their summer vacations, each of their paths, and the end of summer is just around the corner.