So... is All Out!! finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 31, 2017
Manga finished: November 22, 2019
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
All Out!! follows Kenji Gion, a small but energetic high school freshman who discovers a passion for rugby.
Drawn to the sport's inclusive nature, where players of all sizes can contribute, Gion enthusiastically joins the rugby club at Kanagawa High School.
He encounters Sumiaki Iwashimizu, a tall and hesitant classmate, and attempts to convince him to join the team as well.
The anime chronicles their journey as they train intensely, overcoming personal challenges and learning the intricacies of rugby, all while aiming for the prestigious Hanazono national championships.