Shibatarian

In the spring of my third year of middle school, I found Shibata buried beneath a sakura tree. We watched movies and became fast friends, even planned to make a movie together for the school festival...but no one at school seemed to know him. I will discover Shibata and the whole world will turn into Shibata. This is a story of, by, and for Shibata. Now showing in a theater near you.

(Source: MANGA Plus)

*Note: Includes chapter 23.5.*