Call of Cthulhu (often abbreviated as CoC) is a tabletop role-playing game (TTRPG) based on the Cthulhu Mythos, published by Chaosium since 1981.
In Japan, it is the predominant TTRPG (or TRPG there) of choice - equal to Dungeons & Dragons in the West, building off the TRPG fan culture tradition of 'replays' (novelizations of sessions, often paired with visuals to go with the text) with play videos (prerecorded or live) on Niconico and YouTube (ex. Yukkuri-tachi no Cthulhu no Yobikoe). The general continued popularity for 20th century western authors such as Lovecraft, an accessible and easy-to-learn 'Basic Roleplaying' system which allows players to shape the scenarios as they wish (leading to many non-combat/horror-oriented scenarios), publisher support, player-created tools (such as CCFOLIA), and countless number of fan-made scenarios (同人シナリオ, doujin scenario) also contribute to CoC's popularity. In turn, this has resulted in much fanart based on Japanese scenarios.
The name came from the 1926 short story that gives the Cthulhu Mythos its titular cosmic entity Cthulhu. For posts which refer to the short story specifically, tag it with the Cthulhu Mythos tag.
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