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Futaba has started dating Toma. Meanwhile, the time for the school trip is approaching. Coincidentally, the destination is Nagasaki, where Kou spent his final days with Akari. Witnessing the intimate relationship between Futaba and Toma, Kou feels uncomfortable. On the other hand, developments begin to unfold in the relationships between Shuko and Kominato, Makita Yuriko (Riko) and Naigu Haruhiko (Miyazato Soru). Kou decides to take action to create new memories in Nagasaki.