So... is Mujaki no Rakuen finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: August 29, 2016
Manga finished: May 02, 2018
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Mujaki no Rakuen tells the story of Shouta Handa, a 25-year-old man dissatisfied with his current life.
After an embarrassing class reunion where he feels inadequate compared to his successful and attractive female classmates, Shouta experiences a strange incident.
He's transported back in time to his elementary school days, retaining his adult mind but inhabiting his younger body.
Now, Shouta must navigate the challenges of being a grown man surrounded by his young, innocent, and now very close, female classmates, all while grappling with the bizarre circumstances of his time travel.