The Genius Prince's Guide to Raising a Nation Out of Debt, Hey, How about Treason? Novel Vol.2 (US)

Even as the heir to the throne, Prince Wein of Natra continues to plan out his scheme to cash in on his puny kingdom and retire in hiding for good. But when a princess from the Empire catches wind of his successive victories, she waltzes into his palace to ask for...his hand in marriage!?