A centipede monster and an alumnus of Yokai Academy who appeared in chapter 27 of the first serialization. He was ordered by Mikogami to kill Tsukune in order to test his vampiric abilities, which succeeded after he was quickly dispatched when he held Moka hostage. Unlike the other monsters that graduated, Hyakushiki loves to eat humans, but is forced to keep his hunger at bay no matter how crazed he gets, as he would reveal the existence of monsters and end up in deep trouble because of such.

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