When Ashiya begins working part time at the Mononokean, the master Abeno impresses upon him that he should pretend not to see any yokai other than the Mononokean's clients. However, the kind-hearted Ashiya is unable to keep his word, and the yokai won't leave him alone. Based on their surprising strength and numbers, Abeno believes there must be a powerful demon serving as their leader.
A yokai who calls himself the 
Master of the Mononokean.
Von einem Yokai, der sich als
Meister des Mononokean bezeichnet.
Un yokai que se hace llamar
el amo de Mononokean.
Um yokai que se denomina
 mestre mononokean.