Kiyoku Yawaku

Taken from Perfect Illusions:
Yuma is having trouble warding off perverts every morning on her way to school. Her classmate Suwa starts going to school with her, in order to protect her, and the two become a couple. However, Yuma is also interested in her biology teacher who rides the same train as her every morning, and…
The series is composed of coherent episodes that feature different characters.
Kiyoku Yawaku won the 33rd Kodansha Manga Award for shoujo in 2009.