Tensai Ouji no Akaji Kokka Saisei Jutsu

The Genius Prince’s Guide to Raising a Nation Out of Debt (天才王子の赤字国家再生術, Tensai Ouji no Akaji Kokka Saisei Jutsu) is a Japanese light novel series, written by Toru Toba and illustrated by fal_maro. The king of Natra has fallen ill, leaving the only hope for his kingdom to his son, capable and wise Prince Wein Salema Arbalest. However, if the prince has anything to say about the matter, he would rather sell off the Kingdom of Natra to the highest bidder!