Hase nota que Kaori parece muy alejada del resto de sus compañeros de clase, haciendo un movimiento atrevido, le pide ser su amigo, solo para descubrir que al comienzo de cada semana ella se olvida de todo, y de todos, de la semana anterior.

Una nueva semana significa una nueva presentación entre Hase y Fujimiya. Después de volver a conocerse, Hase le sugiere a Fujimiya que debería llevar un diario.

Hase convence a su amigo Shogo para que almuerce con él y Fujimiya. Siempre pesimista, Shogo duda de la afirmación de Fujimiya sobre su pérdida de memoria.

Hase comienza a ponerse cada vez más celoso de la relación de Kiryu y Fujimiya. Después de pelear por primera vez, Fujimiya pierde algo querido en el camino a casa.

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".

Fujimiya brings her new friends over for a study session at her home. Fujimiya's mother dotes on them all, as all mothers do, excited to see her daughter with friends. Later, Hase meets Fujimiya's mother at the park, and she reveals what she knows about her daughter's memory issues.

While Fujimiya continues making new friends, Hase begins to miss the times when it was just the two of them. With summer break coming up soon, Hase realizes that they wont be able to meet regularly anymore.

Fujimiya and her growing circle of friends take a trip out to the beach, where Shogo helps Hase discover his true feelings for Fujimiya.

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.

Yuki, still interested in being friends with Kaori, sets out to find out why Kaori grew upset with her.

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.