**"Now, sing of your sin."** Age: 15 / Gender: Unknown / Personality: Calm and composed / Height: 157cm / Appearance: Beige short-cut hair, sky-blue eyes with a hint of grey, cat-like androgynous features / Traits: Wears a dark guard cap, dark navy guard top, grey shorts, and a dark navy cape. Not easily swayed by words. Has a slightly childish side. The only person who can hear Jackalope's voice. Refers to prisoners primarily by their prisoner numbers.

**"I love this prison that you all created."** Age: 15 / Gender: Unknown / Personality: Calm and composed / Height: 157cm / Appearance: Beige short-cut hair, sky-blue eyes with a hint of grey, cat-like androgynous features / Traits: Dark navy guard top, grey shorts. Not easily swayed by words. Has a childish side. Influenced by the deaths of the prisoners, they have thrown away their guard cap. The tendency to get very angry has faded; they now try to face and talk to the prisoners sincerely and calmly. Accordingly, when extracting mental images, they no longer use prisoner numbers and call them by their names. A person from the future who has experienced the 1st, 2nd, and 3rd Trials.

**Think ve~ry carefully before you choose. You—no, all of you—that is all you have to do.** Supposedly a UMA inhabiting Wyoming, USA, but for some reason, he serves as a prison guard alongside Es. He also acts as the guide for "Milgram," teaching Es about the prison and the duties of a guard. He speaks human language, loves to chatter, and has a mischievous personality. However, his voice seems to be audible only to Es. Age: 3 / Height: 80cm (including horns) / Traits: Grey fur, dark guard cap, dark guard cape. Serves as the chef and guide of Milgram. Jackalope's voice is only heard by Es (the other prisoners cannot hear him).