So... is Lv1 Maou to One Room Yuusha finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 18, 2023
Manga finished: June 04, 2024
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
Ten years after a legendary hero defeats the Demon Lord, the Demon Lord unexpectedly resurrects, but in a weakened, childlike form.
Seeking revenge, the Demon Lord finds the hero, Max, living as a disillusioned and unmotivated recluse.
Disappointed but determined, the Demon Lord decides to live with Max, hoping to help him regain his former glory and become a worthy opponent once more.
However, the Demon Lord soon discovers that something happened during his absence that profoundly changed Max, and the reasons behind the hero's downfall are far more complex than he initially realized.