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The Gamma World (眼魔の世界, Ganma no Sekai, lit."Eye Devil's World") is an extradimensional planet where the Gamma reside in the form of Eyecons, passing through to the human world through Gamma Holes and taking humanoid form.
The planet is covered with a red atmosphere, with raging sandstorms. The atmosphere has a harmful effect on the habitants, which gradually weakens them. After the sky is purged by Akari's and Igor's device, it becomes bluish like that of the Earth.
The monolith also serves as a gateway to the Gamma's world. It was through the monolith that Makoto Fukami was sent to the Gamma world as a child alongside his younger sister Kanon in 2005. While Makoto had apparently remained intact, Kanon was left reduced to the form of a Gamma Eyecon as Makoto became Kamen Rider Specter, fighting to claim the 15 Ghost Eyecons and restore her. Chikara Saionji, encountering Makoto as a young man 10 years later, spoke to him of the incident, implying that it was a result of Ryu Tenkuji's experiment in studying the Ganma. Meeting him again, Saionji later elaborated, claiming that Ryu Tenkuji, as the Ghost Hunter project leader, wanted to perform an experiment to see if a human could enter the Gamma world. Saionji went on to claim that while he and the other members of the team opposed his idea of human experimentation, Tenkuji had activated the monolith without their knowledge. However, it turns out to be Saionji himself, who secretly used an experiment on the Fukami siblings, opening the monolith and activated the Gamma Hole which sucked the two siblings, just before Tenkuji and Kenjiro Igarashi arrived too late to stop Saionji from escaping.
The migration of Adonis's people
In Yayoi period, Adonis, his family and his villagers left Earth through the Monolith and arrived on this planet, thanks to the power of the Great Eye and his wish for a world without poverty. Adonis became the emperor of the new world, and the intermediary to the Great Eye's power.
However, the settlers soon learned that their new homeworld had an unfriendly environment and its red sky inflicted them with many diseases. Adonis's wife and first son subsequently died from some illness. In despair, Adonis strove to create a perfect world where death would not exist. The emperor had Edith deploy the Gamma System using the Great Eye, which included the separation of consciousness into Eyecons, and the permanent preservation of the body in life-support capsules.
The first civil war
One man, Danton, opposed the Gamma System, believing that it was unstable and would eventually collaped. He instead proposed a plan to remodel the body of the Gamma people into beings called Evoludes. To this end, Danton researched and created artificial humans, with Makoto Fukami and Kanon Fukami being the ultimate creations of his project. As Adonis rejected his plan, Danton waged a civil war against the emperor, but his faction lost and he was soon imprisoned and thrown into space.
Gamma invasion of Earth
Post invasion and the potential second civil war