Kakubu

Kakubu (隠部, Kakubu; lit. "Concealed Division") also known as Hidden Resource (隠れ仕樣, lit. "Underground Resource") is a rank given to the members of the specialized division of Konohagakure Anbu corps. This rank denotes a covert operative that serves directly under the Hokage and his hand-picked councilmen and are thus, outside the jurisdiction of the regular ninja system that is present in the village, as well as the Anbu corps. Unlike the Anbu, most Kakubu are known to operate alone unless specified.