Oshaberi na Jikanwari

Oshaberi na Jikanwari is based on Mizusawa Megumi-sensei's own love story. It is the story of how she had a crush on a boy since primary school and the events that took place while she goes from primary school through junior high to senior high.
(From Esthétique)

Includes a side story about one of the main character's friend, Satsuki Goto, and several oneshots by the author:

The Message
Akari has been keeping a secret from her friend and crush, Wataru. In the spring of 10th grade, she found a tape of Wataru confessing his love to Yayoi, and even after knowing Yayoi had feelings for Wataru, she still hid the tape! Now, two years later, the Akari and Wataru pleasantly bump into Yayoi again...

Landscape of the Second Year
Soko, a second year college art student, is still secretly struggling with her past breakup, but with the help of Kando, overcomes it.