"Dark Zone" (ダークゾーン Daaku Zōn) is a lawless nation of dark societies whose true leadership is yet to be determined.
The Dark Irregulars are an army that gained power through the black arts and forbidden science. Demon World Marquis, Amon is a self-proclaimed leader. He has gained much power through his vassals, which are known as Amon's Followers.
The Spike Brothers Blood Ball team is led by General Seifried. Blood Ball and Gallows Ball are apparently popular sports in the Dark Zone, with Spike Brothers coming up as the championship team. Blood Ball is said to be a combination of Rugby and American Football.
While the Pale Moon circus' leadership is the least clear of the three, it appears that the Hades Ringmaster is in charge. Their circus, while popular, serves covertly as an elite assassination corps. It is suggested that they have no true agenda, and will serve whomever is the champion in the Demon World Cup.
This nation is represented with the color purple.
Days and Nights of Sonne Grab, the Land of Everlasting Night
"Dark Zone" hosts more mysteries than any nation else, one of the mysteries being "Sonne Grab", the southernmost place of the nation, a realm of vampires where other nations cannot see. Known as "the Land of Everlasting Night", the sky of Sonne Grab is covered by black fog from day to night, and sunlight cannot reach the land even at noon. The origin of the fog is unknown, but an extremely realistic-sounding hypothesis exists, that "a deceased demonic lord's leftover thoughts became the black fog, and stays in the realm of men". There are other mysteries in Dark Zone remained to be found out, and interested investigators can form an endless parade. However, the investigation teams from other nations are harassed by psychics who attack intruders indiscriminately and bandits who aim at their equipment. None can only find out all truths of Dark Zone unless waging a war.
The Legend of Demonic Lords in Sonne Grab
In regards to the black fog shrouding Sonne Grab, the Land of Everlasting Night, legend says, the black fogoriginated from a war between two powerful demonic lords, in times when Dark Zone was not even a nation. "'The Blue Demonic Lord' and 'the Black Demonic Lord' descended to this land, once a nameless island. The Demonic Lords were attracted by the residing dark elementals, and decided to stay on this land and recruited followers. As time goes by, their followers grew to thousands, and thus conflicts arose. They argued, when the land was to be established as a nation, who would become the king. Arguments turned to war, and the bloody war ended as the Blue Demonic Lord rose as the victor. The defeated Black Demonic Lord were reduced to dusts, together with its followers. Nonetheless, the grudge and the obsessiveness of the dead imbued the dusts, reincarnated as black fog and remained in the world. And so, the black fog shrouded the sky of the battlefield, and sunlight can no longer reach the battlefield. From then, Sonne Grab became barrel land of everlasting darkness without even a grass."