Dōkeshi is a Futakuchi-Onna. Futakuchi-Onna (ふたくちおんな, "two-mouthed woman") are a type of yōkai or Japanese monster. She is characterized by her two mouths – a normal one located on her face and a second one on the back of the head beneath the hair. There, the woman's skull splits apart, forming lips, teeth and a tongue, creating an entirely functional second mouth. He pretends to be a normal school boy and usually hides the mouth with a hat.