The Genius Prince's Guide to Raising a Nation Out of Debt (Hey, How About Treason?), Vol. 6 (light novel) - Falmaro, Toru Toba

IN THE UNEXPLORED REACHES OF THE OCEAN​Clear skies. Deep-blue sea. Tropical sun baking the sandy beach. Wein finds himself whisked away to the Patura islands in the tropical south, trying to make the best use of his access to the port in Soljest. These islands are at the top of his list of potential trade partners, and if he doesn’t come back to Natra with a deal in hand…let’s just say his monthly expenses might run him completely dry. It seems, however, that the gods are not on his side: One little slip-up lands him behind bars in the island nation. The only silver lining, it seems, is that his neighbor the next cell over seems like an interesting guy…who might have some-thing to do with the hunt for the Rainbow Crown, a piece of treasure housing magic that can control all of Patura!