Onnanoko tte Honto ni Mou
女の子ってホントにもう · おんなのこって ほんと に もう
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Story 1 - Junior high third year Yue is convinced that being a girl really, really sucks because of... that you-know-what time of the month. But her opinion starts to change when she stumbles into the infirmary one day and accidentally comes across a certain boy named Sagami! (Source: Fateful Encounters)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections