Wakaba-san Chi no Aoi Koi

Youth Romcom about 4 sisters who all experience their first love at the same time. While the eldest is having a crush on the guy at her part-time work, the other three are dealing with their first romantic experiences with boys in their classes and school clubs. Every night the four are having heart-to-heart girls talks as they navigate their respective first loves.

https://www.cmoa.jp/title/308766/