The series has set Kazuya Murata as the general director and Masaki Watanabe as the series based on the scripts by Mado Nozaki.
Plot concept: The story follows the protagonist Kojiro Shindo, who is a shrewd negotiator at the Ministry of Foreign Affairs of Japan.
A mysterious person (?) Yaha-Kui Zashunina who comes out of Kado tries to make contact with human race, and Shindo in the cube has to work as a mediator between human and Yaha-Kui Zashunina.
Crunchyroll will be streaming the property with episodes zero and one on April 6th, 2017 at 10:00am ET.