A massive underground bunker once excavated by the Self-Defense Forces in preparation for a war on the surface. Abandoned by the government, these ruins have undergone a hideous evolution into a lawless underground rehabilitation facility isolated from the surface, commonly known as "The Pit."

An underground quarantine facility beyond the reach of surface laws. This is the full picture of The Pit—a pleasure district formed within the remains of a vast underground complex.

There is no way to distinguish between day and night; artificial lighting illuminates the space with a constant level of brightness at all times. The air in the city is thick with stagnant exhaust smoke and an unpleasant sour stench resulting from poor sanitary conditions. Newcomers from the surface are invariably overwhelmed by the environment. While crime and violence are everyday sights here, the residents go about their lives with a strange sense of detachment.

There is no police organization inside; it is a completely non-face-to-face managed society where surveillance is conducted entirely through cameras on the walls.

As a result, a unique economy and a distinct pleasure district culture centered on "fighting, gambling, nightlife, music, and alcohol" have taken root within.

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