So... is Joshikousei: Girl's High finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 20, 2006
Manga finished: June 25, 2016
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
Joshikousei: Girl's High follows Eriko and her close friends, Yuma and Ayano, as they embark on their high school adventure.
Filled with anticipation, they may have jumped the gun a bit and bent the rules even before classes started!
The girls quickly realize that their expectations of their new all-girls school might not perfectly align with reality.
However, alongside new classmates who become important friends, they navigate the everyday challenges and joys of high school life, supporting each other along the way.