In a collapsing human world drenched in sin, every forbidden act leaves behind a remnant—
a Shadow born from murder, greed, betrayal, curses, and guilt.

Over centuries, these Shadows evolved into a parallel realm ruled by six terrifying entities known as:

The Shadow Pillars

Demonic beings embodying humanity’s darkest sins.

The Pillars cannot enter the human world freely.
But once every hundred years, they choose a newborn human and infuse him with their essence, creating:

A half-human, half-shadow hybrid destined to lead the Shadows’ invasion.

This century’s Harbinger is Arisu.