So... is Sekai de Ichiban Tsuyoku Naritai! finished or not?
YES, it is finished.
Why?
The anime finished after the manga:
Anime finished: December 22, 2013
Manga finished: December 12, 2013
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
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
Sakura and Elena, members of the idol group Sweet Diva, find their world unexpectedly colliding with the world of professional wrestling.
When Elena is hurt by a wrestler during a televised incident, Sakura's anger pushes her to challenge the wrestler who caused the injury.
Driven by loyalty and a desire to protect her friend, Sakura makes the surprising decision to trade the stage for the wrestling ring.
The anime follows Sakura as she embarks on a journey to become a professional wrestler, navigating the challenges and rivalries that come with this new path, all in the name of avenging Elena.