![](https://cdn.animecharacters.io/images/anime/large/11161-a1d0a5e9.jpg)
Format
TV
Episodes
12
Episode Duration
23 min per ep
Status
Finished Airing
Premiered
Spring 2017
Aired
2017-04-07 to 2017-06-30
Source
Original
Rating
PG-13 - Teens 13 or older
Genres
Sci-Fi
Adult Cast
Studios
Toei Animation
Producers
Kinoshita Group Holdings
Licensors
Funimation
Crunchyroll
Seikaisuru Kado (正解するカド)
Cool-headed and rational, Koujirou Shindou is a government official and master negotiator with a well-earned reputation. While departing on a business trip, a giant cube materializes and his plane is taken undamaged into the mysterious, indestructible structure. As Japanese authorities attempt to identify the cube's properties and origins, Shindou encounters an otherworldly entity known as Yaha-kui zaShunina, who materializes in the form of a human man. He assures Shindou that the passengers are not in any danger and requests help in negotiations with the human world. Hailing from a higher dimensional universe known as Novo, Yaha-kui zaShunina is able to transfer information between Novo and Shindou's universe through a cube called Kado. Despite having these unfathomable abilities, he does not appear hostile. Instead, he announces that he has come to this world with only one intention: to "advance" humanity—starting with Japan. [Written by MAL Rewrite]