Soredemo Sekai wa Utsukushii

Nike is a princess from the Rain Dukedom who possesses the power to control rain. After losing a game to her older sisters, she is forced to marry Livius I, the ruler of the Sun Kingdom, who is known as the "Dreadful King" for conquering the world in just three years. When they first meet, Nike is shocked to learn that Livius, also called "Livi," is actually younger than her. He immediately demands that she summon rain, and when she refuses, he imprisons her. At first, their marriage is merely a formality, but over time, they gradually develop a deeper emotional bond.