So... is Boku dake ga Inai Machi finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: March 25, 2016
Manga finished: November 04, 2016
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
Satoru Fujinuma possesses a unique ability called "Revival," allowing him to prevent accidents by traveling back in time moments before they occur.
When he's framed for a crime in the present, Revival unexpectedly sends him back much further – to his childhood.
He discovers a possible connection between his current predicament and a series of kidnappings and murders that took place during his youth, specifically involving a classmate named Kayo Hinazuki.
Now, Satoru must navigate his childhood, confront past traumas, and try to change the course of events to save his classmate and, ultimately, clear his name in the future.