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A nurse newly assigned to a high-security research facility quickly learns that the rules are simple. However, when she encounters Subject 001, kept in the deepest, darkest cell of the laboratory, those rules suddenly lose all meaning. A dangerous hybrid of a demon, a human, and an unidentified species, Subject 001 is considered a threat that must be eliminated by everyone—and nothing more than a test subject by the scientists. The only person willing to take responsibility for the care of this being, whom no one else dares to even approach, is Y/N.