Casimir wakes up in an unknown place, surrounded by ninety-nine strangers. They have only one thing in common: they are all considered criminals. The problem is that Casimir has no memory of the crime of which he is accused. In front of them stands 404, a mysterious entity who explains the rules of the Bloc: for 3,650 days, they must survive in a world divided into territories, each governed by its own people, creatures, dangers and laws. To die means to lose everything. Killing another participant, on the other hand, offers a chance to get back what they owned. Quickly separated from the others, Casimir meets Aria, a determined young woman who refuses to let the Bloc dictate his destiny. Together, they begin to travel through a world where the inhabitants are often unaware of the existence of the prison that surrounds them. But the farther they venture, the harder one question becomes to ignore: why were they really sent here?