In an animal‑only federation society with no humans, the rule of law coexists with shadowy underworld dealings. Blackstone Maximum‑Security Prison is the territory’s highest‑level penal institution. Though it appears to be a walled facility for rehabilitating criminals, it is in reality an underground fighting arena run by warden Sanka for personal profit. Using sentence reductions and survival privileges as bait, he forces inmates to take part in the life‑or‑death **Blackstone Cage Matches**. He amasses huge profits from outside gambling rings. Countless prisoners have died brutally inside the steel cage. The title of **Prison Cage King** is the most brutal yet coveted honor within these walls.
