So... is Satsuriku no Tenshi finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: October 26, 2018
Manga finished: March 31, 2023
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
Rachel Gardner, a girl with a death wish, finds herself trapped in a mysterious building with no memory of how she got there.
She encounters Zack, a heavily bandaged killer, who also seeks escape.
They form a twisted pact: Zack will kill Rachel once they are free from the building.
Together, they must ascend through the building, facing dangerous individuals on each floor.
Each floor presents new challenges and reveals unsettling connections between Rachel and the building's inhabitants.
Their journey becomes a test of survival and a quest to understand the secrets hidden within the building and Rachel's past.
Will they be able to overcome the obstacles and fulfill their disturbing agreement?