Seal of the Twist: Whispering Investigation Manual

"Kaijin City", a modern city where the thick fog never dissipates, has been experiencing frequent "strange events" that cannot be explained by common sense. Objects are inexplicably displaced, people temporarily lose their memory and see hallucinations, and whispers that do not sound like human voices come from the sewers... Behind this series of events, it seems to point to an ancient secret society and some unnameable existence that is about to awaken. A group of strangers with different identities and weak "abnormal characteristics" are involved by chance. They must work together to solve the mysteries, fight against the fears in the dark, and try to preserve the everyday world they know at the edge of the collapsing reality and sanity. But first they have to keep their sanity.