Heart's Abyss: The Secret KeeperHeart's Abyss: The Secret Keeper; 心渊守秘人; 心渊：守秘人

Have you ever seen a city that devours people? Every day, someone vanishes into thin air. Not death. Not disappearance. But — complete erasure from existence. Their loved ones forget them. Their friends overlook them. Their records show no trace. As if they never came into this world at all… The relevant authorities have designated these incidents: 《Heart’s Abyss》