The Super Demon King Takes Up Farming

After losing the battle to become Demon King, Gass loses everything he could possibly lose. Money, power, servants, guards, manor, territory... Then he opens a letter left to him by his grandfather, the long-deceased Demon Emperor: "My dear grandson, if one day you grow tired of fighting and long for a peaceful life, go to Dawn Town in the northern lands of the Demon Continent. I've left you a wooden house there, along with a small plot of farmland... I hope you can find the true happiness and joy that belong to you."