【MirrorWorld】Then, Then, and Now

[Can I love you forever even if you’re not by my side?]
A junior high school student who cared about each other.
High school students who were trying too hard to be alone or hurting someone because the person they loved was not around
And then, as adults, they vowed to each other that they didn’t want to be apart anymore

This is a serious yuri manga with four stories from middle school to adulthood by Mirariko, 60 pages in total (including the cover).