Konjiki no Gash Bell!!

Konjiki No Gash Bell tells the story of a power struggle: power over the demon world. The struggle takes place between demonic puppets, a type of small demon entrusted to humans who control them using a book that the human reads to unleash the demon's powers. It is therefore the story of one of these demons, Gash Bell, who after losing his memory and being recovered by a scientist, is entrusted to the scientist's son named Kiyomaro. Far from getting along perfectly from the start, the two characters (and especially Kiyomaro, a gifted but difficult child) will learn to get to know and appreciate each other.