Here’s a brief overview of the game, via its official website:
An original card battle game where you can enjoy turn-based battles with cards of characters and monsters that appear in the Dragon Quest series. Defeat rivals from all over the country using your very own deck comprised of various cards. This is a new Dragon Quest told by card battles.
A closed beta test will be held from June 9 to 19. Registration, which is available here, will be open until June 4 at 23:59 JST. Square Enix will accept 2,000 iOS users and 8,000 Android users to participate.
Watch the teaser trailer below.