Hase begins to grow increasingly jealous of Kiryu and Fujimiya's relationship. After getting in their very first fight, Fujimiya's loses something dear to her while on her way home.

Yamagishi Saki inserts herself into Fujimiya's circle of trust. Together, they experience the joyous moments of friendship others take for granted. Hase has his doubts about the new girl, and trails them as they go out on a "date".

The four friends get together on the last day of Summer break to finish up assignments Yuki learns about how much of a difference he's made in Kaori's life.

It becomes apparent to Yuki why Kaori is losing her memory so he decides it best to keep his distance from her in order to preserve her memory.