So... is Boku no Tonari ni Ankoku Hakaishin ga Imasu. finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 28, 2020
Manga finished: April 15, 2020
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
Boku no Tonari ni Ankoku Hakaishin ga Imasu. tells the story of Seri, a regular high school student, whose life is turned upside down by his classmate Kabuto.
Kabuto suffers from chuunibyou, believing he's the reincarnation of a powerful knight with a dark god sealed inside him. He also sees Seri as his loyal companion from a past life.
Seri tries to ignore Kabuto's elaborate fantasies and the embarrassing situations they create for him.
Adding to the chaos is another classmate, Utsugi, who possesses mind-reading abilities and seems determined to further complicate Seri's already bizarre school life.
The anime focuses on Seri's struggles to maintain a normal existence while constantly being dragged into Kabuto's delusions and Utsugi's unpredictable antics.