So... is Koro-sensei Quest! finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: March 10, 2017
Manga finished: October 04, 2019
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
Koro-sensei Quest! reimagines the world of Assassination Classroom as a fantasy RPG setting.
Class 3-E, now magical students, are tasked with defeating their teacher, the powerful Demon King Koro-sensei.
They seek out strong allies like Karma, Itona, and Ritsu to aid them in their quest.
The students face numerous comedic and challenging situations as they train and attempt to assassinate their target, all while navigating the dangers of this new world and other parties vying for Koro-sensei's demise.
Expect lighthearted adventures, character growth, and plenty of laughs as Nagisa and his classmates strive to complete their seemingly impossible mission.