So... is Yamada-kun to 7-nin no Majo finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 28, 2015
Manga finished: February 22, 2017
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
Ryuu Yamada, a delinquent looking for a fresh start, accidentally discovers he can switch bodies with the studious Urara Shiraishi after a kiss.
Their unusual ability draws the attention of the Supernatural Studies Club, led by Toranosuke Miyamura, who recruits them both.
Joined by the eccentric Miyabi Itou, the club uncovers a legend about seven witches at their school, each possessing a unique power activated by a kiss.
The club members decide to embark on a mission to identify these witches and understand their powers, leading to comical and perhaps complicated situations.