Tomo, Noa and Chikako are childhood friends who live in the same neighborhood.
They've been living a peaceful life where nothing much changes.

The midterm exams have ended, and the three of them are finally able to cut loose. They talk about going camping, enjoy school events, and while spending a fairly average time in school, Tomo begins to realize his feelings towards a certain girl...

The “litte romances” in an average life, the everyday events that everyone “probably experiences”, the occasional glimpses of the gestures and feelings of the heroines. Sympathizing with them, laughing with them, crying a little... sharing these things with them, that is MemoriesZero.

[Translation of synopsis from Getchu.com]