Gematsu's report states that Asteria will feature voice acting and a "cross slide" battle system. Gematsu's translation adds that the story will involve "fragments of a star that [make] wishes come true." Unsurprisingly, Asteria's inhabitants seem eager to fight over magical, wish-granting star bits, which brings in the six protagonists to solve the problem.
Each hero is brandishing their own glowing object on the site's home page - we suppose stealing the star fragments for themselves could be a possible solution to the world of Asteria's conflict! Or ... you know, a great way for them to make a lot of new enemies.