Tasogarechou Prisoners

Five years after Japan abolished the death penalty, violent criminals are no longer executed. Instead, they're sent to Twilight Town—an isolated prison city where the law no longer applies. Murder, rape, and every other atrocity are fair game as death row inmates are left to kill one another in a brutal fight for survival.
Wrongfully convicted and sentenced to death, Yuma Sentou is thrown into Twilight Town despite pleading his innocence. Trapped in a living hell where only the strongest survive, can he stay alive long enough to uncover the truth?
A merciless survival battle featuring nothing but death row inmates begins!