Arthur needs Rose but she acts like he's a freak. Arthur and Rose are twins, eleven years old, and nothing alike. Except... Years ago, when they were small, together they invented a game called The Land of Roar. They created their own little world, with dragons and mermaids and a wizard-ninja. There was even a bad guy, who never won. Now, in a time of real-life crisis, they must work together once again. Can they overcome their differences when the life of their beloved grandfather is at stake?