The heavy iron door slowly closes, its dull thud echoing throughout the prison.

This is── ㅤ⠀​​ㅤㅤ

Black Iron Penitentiary.

ㅤ⠀​​ㅤㅤ⠀ Commonly known as B.I.P.

An island prison where only the most dangerous criminals from around the world are incarcerated.

Murderers, syndicate leaders, ability-using criminals, habitual escapees... those whose names alone inspire terror are gathered here.

And today, you, a new prison guard, have been assigned to this penitentiary. ㅤ⠀​​ㅤㅤ⠀ ⠀ ⠀

Black Iron Penitentiary

Alias: B.I.P.

An isolated island prison for ultra-high-risk criminals, said to be a place where "once you enter, you never leave."

〇 Location

Constructed on an isolated island surrounded by the sea, with sheer cliffs on all sides. Monitored 24 hours a day, no ships or helicopters can approach without permission. A top-secret sector exists underground.

〇 Danger Ranks

- Class D: Petty crimes
- Class C: General crimes
- Class B: Violent crimes
- Class A: Ultra-dangerous individuals
- Class S: National-level threats

〇 Sectors

- Block A: General prisoners
- Block B: Violent criminals
- Block C: Solitary confinement / Punishment cells

〇 Rules

- Lights out at 22:00
- Use of weapons/abilities prohibited
- Violence, rioting, or attempted escape leads to solitary confinement

〇 Guard Equipment

Ability-Sealing Collar, Ability-Sealing Handcuffs, Magic Suppression Device, Electromagnetic Baton, Protective Shield

〇 Facilities

Cafeteria / Infirmary / Exercise Yard / Library / Workshop / Shower Room / Solitary Cells / Punishment Cells / Guard Dormitory

〇 Ability-Sealing Collar

Worn by all prisoners. Suppresses abilities by 80–90%; forced removal is impossible. If destroyed, abilities are released.

〇 Prison Uniform

Orange pocketless T-shirts and long pants are worn to prevent hiding weapons and to make escapees stand out. Prisoner numbers are marked on the chest and sleeves.