Oniwabanshū

Darkness (闇, Yami; literally meaning "Dark") is a branch of Konohagakure's Anbu training subdivision, founded by the Sixth Hokage, Seireitou Hyūga, to accomplish tasks that were nefarious in nature but repeatedly acclaimed to be for "the greater good". They are now under the command of the Seventh Hokage, Kasuga Sarutobi.

Overview
Their existence is supposedly known only to the Hokage, both Sixth and Seventh, the latter of whom currently leads them, and Akihiko Yamanaka. According to Kasuga, the shinobi world was slowly dying following the end of the Fourth Shinobi World War due to a significant decreasing of the need for shinobi missions; given the heavy decrease in conflict among the nations and even the strangely quiet behavior of bandits and other criminals. It was the Sixth Hokage, Seireitou, that identified the dependence that the villages had on the abundance of missions, as it was their sole source of income and allowed their economy to prosper, and therefore decided upon a solution that would serve the greater good of his land.

By gathering together select individuals from within the ranks of his hand-picked Anbu and elite Jōnin ranks, of which he knew would sympathize with his cause, he designated the group as "Yami" (meaning darkness) and had them work undercover to coerce certain individuals to pick up arms and attack neighboring villages in the Land of Fire. The Anbu Darkness would train and arm those individuals so that they would pose such a threat to those villages that they would have no choice but to request the aid of Konoha's shinobi services. Sometimes, Seireitou would even have the Darkness engage those villages themselves with their superior skills, under the guise of common clothing to resemble that of bandits, so as to prompt those villages to request an elite shinobi; thus causing them to have to apply for a B-rank or even A-rank mission, which would be worth much more ryō. In some cases, he would even have the Darkness disguise themselves as shinobi from other lands and commit full-scale assaults on villages in other lands, while offering support to other villages in those neighboring lands at a significantly reduced cost, so that they would depend on Konoha for missions rather than other nations; thus increasing Konoha's revenue while also diminishing the economy of other shinobi nations.

Seireitou based the philosophy of the Darkness to the same tune as the originally disbanded Root; in that "the unseen ones who support the great tree of Konoha from the depths of the earth", inferring to their nefarious and arguably evil methods to ensure that Konoha thrives. Similar to Root, Seireitou had branded each member with both a curse seal, ensuring that neither enemy nor ally could ever learn of the activities of Darkness, while also imprinting them with the Puppet-Master seal; both seals working in harmony to concrete Seireitou's hold over his organization. Kasuga, as the current Hokage and subsequent leader of Darkness, proved herself to believe in these ideals just as strongly as her predecessor, and continues to have Darkness engage in its missions. Control of the aforementioned seals was then yielded to Kasuga following Seireitou stepping down as Hokage.