The Sun's Blessing from the Sunny Kingdom of the Wonder Planet provides light to the other kingdoms of the Wonder Planet. Years ago, when the Sun's Blessing was about to go out, the planet was in great peril, but was saved by the legendary Princess Grace. Today, the Sun's Blessing is about to go out again! It's up to the current princesses of the Sunny Kingdom, the twins Fine and Rein, to save the Wonder Planet.