Plot For The Original Tokyo Ghoul: The story of Tokyo Ghoul follows Ken Kaneki, who barely survives a deadly encounter with Rize Kamishiro, a woman who reveals herself as a ghoul, a human-like creature that hunts and devours human flesh, and is taken to the hospital in critical condition. After recovering, Kaneki discovers that somehow he underwent a surgery that transformed him into a half-ghoul, and just like them, must consume human flesh to survive as well. With no one else to turn to, he is taken in by the ghouls who manage the coffee shop "Anteiku", who teach him to deal with his new life as a half-human/half-ghoul, including interacting with ghoul society and its conflicting factions, while striving to keep his identity secret from other humans. (taken from the wikipedia page)
This is another Tokyo Ghoul group, as the admins of the preexisting one seem to be inactive.