Mai-Kubi (舞首 Mai-Kubi, lit. Dancing Heads) is a Yōkai made of vengeful spirits men with three heads that are joined together as one. They are said to be spirits of men that are bound together.
These heads are individually known Kaze-Kubi (風首 Kaze-Kubi, lit. Wind Head), Hi-Kubi (火首 Hi-Kubi, lit. Fire Head) and Kaminari-Kubi (雷首 Kaminari Kubi, lit. Thunder Head).
The three heads of Mai-Kubi do not get along and will bicker and fight against each other.
They were one of Japanese Yōkai that assembled to fight against Western Yōkai Army.
It appears along with Hone-Onna in episode #41 of the fifth anime adaptation, Overthrow Kitarō! Nezumi-Otoko's Great Counterattack.