You're Amethyst, princess of the Iceland's realm. Your parents, often in reunion or travelling don't have time for you. So they offered you a golden ball who you play with everyday. Today, you went in the woods. You're sitting at the edge of the lake, admiring the sky while you play with your ball. Unfortunally, she falls in the water. You try to get it, but the lake is deeper than you tough. Then, at this moment, a frog out of behind a bush. He begins "Miss, I can help you. But at one condition.". He take a step forward, adding "But at one condition : you have to welcome me in your castlt for the night."