In the amazing country of Heartyland, where all sorts of our toys resided, Catherine, an amazing magician, brings wonder to Heartyland, and the amazing king, Norman rules the country with brilliance and revolution. But due to rumors about Catherine and Norman, the country is plunged into the Watermelon war (or the civil war.) This is where the story begins. Two siblings, Luke and Rose choose to figure out what's going on in the castle. As they travel to Heartopolis, they realize that Heartyland isn't as fun as like its portrayed in the theme. The castle is a magnificent structure that towers above Luke and Rose. Once they get inside, the meet Catherine... who's actually a scammer named Moshi who's been violating the powers of everyone. As Moshi gets away, the group wonders if they'll make it through the next challenges.