Mamma Mia! But Different! Pop Punk

In the Land of the ABBA DABBA two kingdoms live side by side, one ruling by day and one by night. What happens when Princess Dagmar of the Lightbringers meets the prince of the Shadow wielders, will their lives change forever, how will their families react to their forbidden romance and will they be able to keep the powers of the Mamma Mia at bay?