"Excalibur is a scale that measures the potential of a King, one who thinks he is worthy enough shall hold its hilt. Together with the proof of one worthy to be a King, it entrusts the fate of Britain to his hands."

Square Enix presents, a Card Battle RPG that paints the story of a million King Arthurs. The plot is written by famed novelist Kazuma Kamachi, who wrote popular light novels like 'Heavy Object', 'Toaru Majutsu no Index', and 'Toaru Kagaku no Index'. Illustration for the cards is done by over 50 different famous illustrators like Kiyotaka Haimura and Takehito Harada. All music is composed by popular musician Maeyamada Ken'ichi, otherwise known as Hyadain, while the theme song, 'Million of Bravery' is performed by Choucho.

Players will take up the role of one of the rulers of Britain, King of Dragons, who is the 98,3067th Arthur to pull out Excalibur.
One million authentic Excaliburs pulled out by one million King Arthurs, the beginning of a story of a true King.