A biker gang that has existed in the town before the creation of The Front of Armament. It is unknown when the group was founded.
Chuujou Akira the head of Hyakki at the time the front was created. Originally Hyakki had its underlings gang up on the new found team but Chuujou put an end to the two teams squabbles. Chuujou and the front had a good relationship until his retirement. During this generation, they were the biggest and strongest gang, with 150 members
Even after Akira's resignment, T.F.O.A and Hyakki were on good terms. Hyakki Leader Kim Hyonchol (Older brother of 7th generation Armament leader Kim Hyongan) helped the Front find the whereabouts of Back-Teria leader Yamagami after Front member Ozawa Shinkichi had been jumped.
During the Armaments 4th generation, a huge war broke out between the Front and Kyouya. A ceasefire agreement was established between all 5 major gangs of the city; T.F.O.A, Hyakki, Kyouya, Skeleton (now Shikabane) and Back-Teria, which split into 3 gangs; The Black Marked Tigers, Hades Owl's, and the Jet Black Scorpion. When this ceasefire was reaggrivated by Shougo's attack on Kyouya figurehead Terakado, the Major Gangs met to deal with the situation without bloodshed. Hyakki President Yamauchi Taichirou was present for the meeting.