YES, it is finished.
This is an original anime and all detected relations are finished. Check the release order section for a complete list of relations.
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 - Prequel
Release date: April 06, 2017
Anime - Base
Release date: April 07, 2017
Seikaisuru Kado centers on Koujirou Shindou, a skilled negotiator who finds himself inside a massive, inexplicable cube that suddenly appears mid-flight.
Inside, he encounters Yaha-kui zaShunina, a being from a higher dimension known as Novo, who intends to interact with humanity.
ZaShunina's purpose is to "advance" humanity, beginning with Japan, and he uses the cube, Kado, to facilitate communication and information transfer between his dimension and Earth.
The story follows Shindou as he navigates this unprecedented situation, acting as a mediator between ZaShunina and the human world, while the authorities try to understand the cube's origins and ZaShunina's true intentions.