William comes from a noble family and possesses exceptional intellect. The school he attends, along with his family"s status, attracts considerable attention from those around him. But one day, due to his uncle William"s misfortune, he loses all his money. Worried about how this will affect his schooling, William returns home. Together with the butler they search for items to sell. But all they manage to find is a room in the basement that William"s ancestors used. In the room there was a magical seal, which William accidentally uses to summon a demon. The demon Dantalion tells William that he has the right to choose the king of the demon world! Naturally, candidates for the throne will hunt William... And who will become king.
