Gang in Toarushi that has grown undrground on multiple occasions to battle the big shot's Factions in the town. Normally under control of Hisashi Amachi.
Yamamoto the leader of the gang stepped out, with the other main members arrested, the new head of Jet Black Scorpion was taken out by other members of the gang. They became a bunch that goes around mugging people and assaulting girls. They also started recruiting mid schooler to boost their numbers.
He was plotting something with Tsukimoto Mitsunobu before Guriko showing up.
After almost being destroyed by Suzuran, Hisashi Amachi offered help to re-organize the gang. Uchida Kouji became the new head, but the one pulling the strings moving the gang was Mitsuki Kunihiko. One of his first actions was infiltrating Ikeda Ryou and Okuno Keiichi in the Hyakki and Hashida Tomoyuki in the Black Marked Tigers and ambushing Harumoto Shigeo to start a war between the two gangs. They also would later attack members from Hades' Owl using Armament's symbols to start a war between them, but it was discovered by Fujishiro Takumi who managed to capture Mitsuki Kunihiko. After he spit everything out he was kicked by Amachi.
The KKK Demons lead the Jet Black Scorpion against the Armament but they were defeated.