So... is Kaidan Restaurant finished or not?
NO, it is not finished.
Why?
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
Kaidan Restaurant is an anime series for children presented as a three-course meal of spooky stories.
Each episode features three separate tales: an appetizer, a main course, and a dessert.
The first two stories focus on Ako Ozara, a sixth-grade girl, and the strange and unsettling events that impact her and her schoolmates.
The final story of each episode is a short, self-contained ghost story narrated by Ako and her friends.
Essentially, it's a collection of spooky and mysterious tales geared towards a younger audience.