The Genius Prince's Guide to Raising a Nation Out of Debt (Hey, How About Treason?), Vol. 7 (light novel‪)‬

Imperial Prince Demetrio and his advisers are stumped. And for good reason, too. Wein, the Crown Prince of Natra, has joined their meeting, and he wasn’t really invited. Wein is technically only here to return a favor to Imperial Princess Lowellmina, who can’t stand to watch her three brothers rip each other apart for the throne. Somehow or other, he finds himself teamed up with Demetrio, who seems like he’s the least likely of the three to become the next emperor...