Synopsis: Sorry, The writing of the adventure became the Devil's.

Vellmort XIII, the newly crowned Demon Lord, is the protagonist of the manga. He has conquered the entire Underworld with no resistance besides his loyal maid Sarah. Despite having every luxury at his disposal, including fancy food and beautiful concubines, Vellmort is plagued by boredom. One day, a solution presents itself, and Vellmort decides to team up with Sarah for an invasion of the human-occupied Earth. Will Vellmort triumph, or will justice prevail and he face his demise?