Welcome to the Oni Island Penitentiary

Isolated from the rest of the world, a remote island serves as the setting for a brutal penitentiary where inmates endure relentless torment. The facility is governed by three fearsome oni administrators named Ura, Gaki, and Hashihime, who subject the prisoners to daily cycles of suffering without reprieve. Under their oppressive rule, hope seems entirely extinguished, and the captives are left to face an endless routine of cruelty within the confines of their cells. However, the grim status quo is suddenly disrupted by an unexpected turn of events. In a rare moment of carelessness, Ura accidentally drops the key to the prisoners' cells. This single mistake introduces a dangerous possibility into an otherwise hopeless environment. With the means to unlock their confinement now within reach, the inmates are presented with a fleeting chance that could alter their fate, setting the stage for a tense struggle against their demonic wardens.