This manga tells a story about new Demon Lord Vellmort XIII. Day after day he suffers from boredom, because all Underworld is already conquered by his predecessors, nobody (except maid Sarah) dares to oppose him and he is already sick of luxury food and jollifications with concubines. But some fateful day he has found a solution and together with Sarah has gone to conquer the Ground, populated by humans. Will he succeed in his plan or will he die by the hands of justice? 

Magical rod "Ryin Rod" has been awakened. When the compatible user "Magical Girl Pretty Bell" appears, it always says that the world will be at risk. Milk and Cocoa are angels who protect the rod and support magical girl pretty bell, They have come to the town where a compatible user, Misaki Eri lives, while being attacked by an enermy. However the rod didn't point to Eri but pointed to a body building neighbor, Takada Atsushi. Why did the rod pick Atsushi instead of Eri and why there are two compatible users?