On the day she entered college, Haruki met Sakura in her classroom. They were attracted to each other and lived together after graduation, but their farewell came suddenly.

Cherry blossoms had disappeared from the world …

Five years after that, the fifth cherry blossom season. Haruki, who was still disappointed, accidentally discovers a diary. It was an unfinished ten-year diary written by Sakura …

***

君と一緒に綴る最後の日記。
大学に入学した日、春喜は教室で桜と運命の出会いを果たす。互いに惹かれ合い、卒業後も一緒に暮らしていた二人だったが別れは突然やってきた。桜がこの世から消えてしまった…。あれから5年、5回目の桜咲く季節。未だ失意の中にいた春喜は偶然にも一冊の日記を発見する。それは桜が綴っていた未完の十年日記だった…。