Hase notices that Kaori seems very detached from the rest of her classmates. Making a daring move, he asks to be her friend, only to find out that at the beginning of every week she forgets everything, and everyone, from the week before.

A new week means a new introduction between Hase and Fujimiya. After they get to know each other again, Hase suggests to Fujimiya that she should keep a diary.

Hase convinces his friend Shogo to eat lunch with him and Fujimiya. Ever the pessimist, Shogo doubts Fujimiya's claim of her memory loss.

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 but Hase has his doubts about the new girl.

Fujimiya holds a study session at her home; Hase meets Fujimiya's mother.