So... is Dia Horizon finished or not?
YES, it is finished.
Why?
This is an original anime and all detected relations are finished. Check the release order section for a complete list of relations.
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.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
Dia Horizon is a short, comedic anime that playfully promotes its multimedia franchise.
The characters, presented in a cute, chibi style, are aware of their existence within the anime and directly address the audience.
They frequently discuss and comment on the Dia Horizon mobile game, which is being released concurrently.
The anime also serves to advertise the upcoming full-length TV series and the already available 4-koma manga.
Essentially, it's a lighthearted and self-aware marketing tool presented as an anime.