So... is Hantsu x Trash finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: November 04, 2016
Manga finished: January 06, 2020
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Hantsu x Trash follows Youhei Hamaji, a directionless and perverted high school freshman, as he stumbles into the world of water polo.
Tired of rejection and lacking motivation, Youhei is lured into the water polo club by the promise of physical contact with girls.
The story centers on whether Youhei, known for his inability to commit to anything, can find a sense of belonging and purpose within the unconventional environment of the water polo club.
Ultimately, the anime explores Youhei's potential transformation as he navigates the challenges and unexpected relationships that arise from his involvement with the team.