NO, it is not finished.
The anime finished before the manga:
Anime finished: June 29, 2017
Manga finished: December 19, 2022
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
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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Anime - Base
Release date: January 08, 2017
Anime - Sequel
Release date: June 29, 2017
Demi-chan wa Kataritai follows the everyday life of biology teacher Tetsuo Takahashi, who is fascinated by "Demi," creatures who are part human, part monster.
He seeks to understand them better and gets the chance to do so when he encounters several Demi students at his high school.
The story focuses on Takahashi's interactions with these Demi girls – a vampire, a dullahan, and a snow woman – as he tries to learn about their unique perspectives and challenges in integrating into human society through informal interviews and casual conversations.
He also interacts with a succubus teacher, further expanding his understanding of Demi. Ultimately, the anime explores the idea that Demi are perhaps not so different from humans after all, highlighting their shared experiences and emotions.