Chillin' in My 30s after Getting Fired from the Demon King's Army

For more than 30 years, Dariel has been a loyal soldier in the Demon King's army, having been raised by Granbarza, one of the Four Heavenly Generals. However, as Dariel lacks any magical potential, he is nothing but a disgrace in the eyes of Granbarza's son, Bashbarza, who fires Dariel right after a...