Seikaisuru Kado

Kado: The Right Answer (Japanese: 正解するカド, Hepburn: Seikai Suru Kado) is a Japanese CG animation television series produced by Toei Animation. The series follows master negotiator Kōjirō Shindō, working for the Ministry of Foreign Affairs, as he chooses to represent Yaha-kui zaShunina, an otherworldly entity with the main intention to advance the world by progressively introducing four mysterious devices to humanity.