Shindou Koujirou is a highly-skilled negotiator working for the Ministry of Foreign Affairs. As his plane at Haneda airport prepares to take off, a huge mysterious cube appears from the sky. "It" expands rapidly, and absorbs the passenger plane and its 252 passengers.

The cube's name is "Kado".

A strange being called Yaha-kui Zashunina appears from within Kado and tries to make contact with humanity. Shindou, who was been absorbed by Kado, ends up taking on the role of mediator between Yaha-kui Zashunina and humanity. The Japanese government sends its own negotiator, Tsukai Saraka. Who is Yaha-kui Zashunina? What does he want?

Source: crunchyroll

Note: The first episode was digitally distributed by Amazon Prime Video one day before the regular TV broadcast. The first three episodes screened on a special event on April 2nd

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Alternative version: Kado: Beyond Information