Ep. 9: Friends gather on the final summer day before a new transfer student disrupts Kaori's fragile memories.

On the last day of summer break, Yuki, Kaori, Shogo, and Saki meet at Kaori's house to finish homework. Shiho discusses how Yuki's friendship benefits Kaori, while Shogo emphasizes the importance of this process for her condition. Saki leaves early, and Shogo gives her his completed answers, recalling a similar act from their elementary school days. Yuki finishes his work and asks about Kaori's improving memory, which she attributes to their friendship. The next day, the second semester begins. Inoue rearranges the seating, placing Kaori next to Yuki. He then introduces transfer student Hajime Kujo, who sits beside Kaori and accuses her of breaking a promise. This accusation causes Kaori to collapse from stress. When she wakes up in the nurse's office, her memories of Yuki are completely reset again.
Episodes
- Ep. 5 · Saki Yamagishi and Kaori build a friendship despite her memory loss and no-talking rule.
- Ep. 6 · Yuki studies with Kaori and learns about her past accident from her mother.
- Ep. 7 · Kaori and Yuki struggle with communication during summer break preparations.
- Ep. 8 · Friends visit the beach but bad weather leads to arcade refuge and romantic tension.
- Ep. 9 · Friends gather on the final summer day before a new transfer student disrupts Kaori's fragile memories.
- Ep. 10 · Yuki confronts Hajime over Kaori's lost memories and resolves to rebuild their friendship.
- Ep. 11 · Yuki learns the tragic truth behind Kaori's memory loss and distance from Hajime.
- Ep. 12 · Yuki and Kaori reconcile their friendship through honest conversation and shared memories.