Chimimo

Mei Onigami finds a peculiar round creature in her home that only says "chimi." Her sisters, Mutsumi and Hazuki, decide to keep it until someone comes looking for it. But when one of them accidentally says the word "hell," more of these creatures appear-until there are twelve in total. Things take a strange turn when the creatures open a portal, summoning an envoy from Hell. The envoy, Jabberwock the Eighth, is a horned, fanged man covered in fur, sent to unleash chaos on earth by his boss. However, the human world isn’t as easy to conquer as he thought, so the Onigami sisters let him stay with them-along with his "Chimimoryo spirits," the round demons that came before him. The sisters call him Jigoku-san, but despite his grand plans to take over the world, he soon realizes that surviving the ordinary struggles of human life might be the real challenge.