Square Enix released Kaku San Sei Million Arthur as its first mobile card game based on the folklore of King Arthur in Japan in 2012.
Square Enix released a sequel game, titled Kai-Ri-Sei Million Arthur, in Japan in 2014.
The Operation Han-Gyaku-Sei Million Arthur (Han-Gyaku-Sei Million Arthur) massively multiplayer online role-playing game also inspired a television anime that premiered in October 2018, and the second season premiered in April 2019.
The official website for the Kō-Kyō-Sei Million Arthur iOS and Android game announced on Wednesday that the game will end service on May 12 at 3:00 p.m. JST.