So... is White Album 2 finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 29, 2013
Manga finished: October 22, 2015
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.
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Synopsis
Haruki Kitahara is trying to keep his school's light music club from falling apart before the school festival. He wants to perform one last time with the club.
While practicing, he unexpectedly finds himself playing along with a beautiful voice and piano. This collaboration sparks a turning point in his final semester.
The anime follows Haruki as he navigates his final months of high school, dealing with the complexities of relationships and the excitement of creating music, all while trying to achieve his dream of performing on stage.