The five people were summoned by the gear letter, encountered corpses and silver tentacles, and found no clues, so they became candidates for the "vessel" of the abyss? The Cthulhu Running Group begins in horror. The gear letter leads to a strange case, a corpse is hidden in the archives, and silver tentacles seep into the wall. During the investigation of the five people, it turns out to be the "gear" coveted by the abyss?