The Bookmark of Demise (終焉ノ栞 Shuuen no Shiori) is a cursed bookmark from an urban legend that gets only told to those who visit the main characters' school.
The Bookmark of Demise is told to have a black cat in the bookmark which marks a page where the main characters' urban legends are listed. It is also said to have a black, mysterious book with the black cat as a bookmark.
- The Demise Game is a scenario that starts after the bookmark of demise has been moved to another page. The rules say that the one who started the game, called the "Fox", must be killed in order to stop the game. If the fox is not found, everyone dies. A person involved in the game will receive messages from the Kokkuri with demands that have to be followed, or else the one who received the message will die after one week. If the contents of the demand are seen or discovered by an outsider, that person will die. The game has to be played to the end, otherwise there is no way out.
- Kokkuri (こっくり, 狐狗狸) or Kokkuri-san (こっくりさん) is a Japanese game, popular during the Meiji period, that is also a form of divination, based partially on Western table-turning.
- The name kokkuri is an onomatopoeia meaning "to nod up and down", and refers to the movement of the actual kokkuri mechanism. The kanji used to write the word is an ateji, although its characters reflect the popular belief that the movement of the mechanism is caused by supernatural agents (ko 狐, foxes; gu 狗, tengu; ri 狸, tanuki).
- The word kokkuri refers to the game, the actual physical apparatus, and the spirit(s) believed to possess the apparatus in order to communicate with humans. The physical mechanism is composed of three bamboo rods arranged to make a tripod, upon which is placed a small pot, which is covered by a cloth. Three or more people will place their hands upon the kokkuri and ask the spirits a question, which that spirit will in theory answer by moving the pot or remaining still.
- Japanese folklorist Inoue Enryō wrote about the kokkuri phenomenon, denouncing it as mere superstition, yet his efforts did not succeed in depopularizing the game. Some scientific figures of the age attempted to explain the phenomena with the more scientific sounding yet ultimately equally mysterious trope "human electricity".
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