During a night shift at the antique museum, the protagonist faces the critical danger of a dark mark threatening to destroy a trapped spirit. As the spirit's energy collapses, the protagonist uses a mysterious light to mend the damage and offer peace, gaining the spirit's allegiance and enhanced perception to detect hidden threats. This victory rewards him with a bonus and rapidly growing spiritual powers, transforming his physical strength and senses. Despite these gains, the escalating supernatural challenges ahead leave him uncertain about what the rest of the night will bring before dawn.