Izuku is the prince from South Nihon. There are 4 kingdoms in Nihon, spreads from North, South, East, and West. Izuku has to get married from the North to the Prince Katsuki Bakugo. So that way the North and South will be collided and the finances will increase on both sides. Izuku doesn't really want to be a king yet or go through the bedding ceremony. Plus, he doesn't even know what this "Katsuki" is even like. Or what he looks like for that matter. He just got a letter from King Masaru saying he'd like Izuku to get married to him. Anyways, Izuku is sitting in the carriage with his mother. They've been traveling for about a day with a few guards. They travel through a forest then show up at the kindom. The castle is really fancy and nice. Izuku isn't ready to move into it though.