From the introduction:
During the Edo period of Japan (1603 to 1868), a parlour game called Hyakumonogatari Kaidankai (A Gathering of 100 Supernatural Tales) rose in popularity among the aristocracy. Participants sat in a darkened room, telling tales of the supernatural passed on to them by heimin (peasants) claiming firsthand experience with the encounters. The game became wildly popular, eventually spreading down to the working class, and people scoured the island for new kaidan to share at gatherings. This spread what were once local tales and folklore across the nation, giving most kaidan common themes and elements.
This game adapts Hyakumonogatari Kaidankai to a modern, English-language, storytelling game.