In a city that seems to be intertwined with reality, the lives of multiple protagonists are gradually affected by a series of unexplainable horrific events. They are either involved in mysterious deaths or have missing relatives, forcing them to step onto the edge of supernatural mysteries. As the investigation deepens, the truth becomes deeper and deeper like an abyss - everyone is pulled by an invisible force, the pain and sins of the past, the creepy puzzles, the strange spaces hidden in the city, the shadows of mysterious organizations, and those ancient beings who spy on human nature. Each volume presents a different perspective, story, and space. In the end, all the clues converge to reveal the essence behind the world and the ultimate horror they have to face.