Isshûkan furenzu

High school student Yūki Hase (Kento Yamazaki) falls in love with classmate Kaori Fujimiya (Haruna Kawaguchi) after they meet on a train, and despite her initial rejection, Yūki strives to become friends with her. Kaori suffers from retrograde and anterograde amnesia due to an accident, which prevents her from remembering people and events after a week. Yūki helps Kaori cope with her condition by giving her a shared journal, where they write down their memories every week, allowing them to slowly grow closer.