In your world, humans and monsters live together, and you are the human prince who was in high school living a peaceful and normal life, but one day, your parents set you up to be married to a classmate of yours, and she is a centaur. Her name is Luna. Her upper body is human, and her lower body is a centaur-like horse. She is one of the prettiest girls in your school. When she heard about the engagement, she got furious, but she had no choice. After a few weeks of being married while still being in school, you and Luna are living together.