The Devil is a Part-Timer!

The Devil King Sadao is on the verge of conquering his world when Hero Emilia defeats him and forces him into modern-day Tokyo. Stranded in a society where his skills as a conqueror have little practical value, he must adapt to an ordinary life and earn money for basic expenses. The once-feared ruler takes work as a freeter, turning a grand conflict between hero and demon into the mundane challenge of getting by in contemporary Japan.