Sunlight is a part of its residents' daily existence in the Sun Kingdom, and rain is something they've never ever heard of. In a remote realm known as the Rain Dukedom, however, the weather is reversed, and everyone has the ability to make rain with their voices. In the three years after he was crowned king, Livius Ifrikia has conquered the whole planet and increased the Sun Kingdom's dominion. Livius decides to marry Nike Remercier, one of the Rain Dukedom's princesses, after discovering his ability to make rain. However, rumors have circulated that Livius is a harsh, violent, and despotic king, and when news reaches the princess, she begins to brace herself for the worst.