Tokyo Ghoul (東京喰種, Tōkyō Gūru) is the original oneshot for the manga.
It starts with a TV show with a ghoul activist as a guest. The ghoul activist talks about the recent murders which are done by a ghoul. The scene then shifts to Ken Kaneki, a ghoul who works as waiter along with Touka (Oneshot). The manager of gives some sandwiches to both Kaneki and Touka for lunch. Touka politely refuses as she is on a diet. After Kaneki is appointed that he can not use the same excuse, he manages to eat it. He then quickly goes in the toilet to vomit it back out due to him being unable to digest it. Yukinori Shinohara, a ghoul investigator, then notices Kaneki's weird behavior.
Kaneki then goes home where he keeps the bodies of people he killed to eat later on. After eating a human arm, he visits a café where he bumps into ghoul investigator Yukinori. He then is forced to eat a sandwich which he tries to but ends up vomiting it out on the table. Stricken with anger, he then decided he was going to kill Yukinori for making him go though with that.
Touka sees Kaneki stalking Yukinori and wonders what he was going to do, so then she starts to follow him. As Yukinori stops in a deserted part of the station, Kaneki tries to do a stealth attack but he ends up being outplayed by Yukinori, whom then overwhelms Kaneki. Touka shows up surprised and tries to defend Kaneki. Kaneki seeing a way out, uses Touka as a hostage so that he can escape. However, Yukinori believes that losing a human life is worth killing a ghoul. He then tries to kill Kaneki regardless of the hostage. Shockingly Touka manages to scratch his face. It is then revealed Touka is not a human, but a ghoul like Kaneki and that the recent killings was done by Touka herself, not Kaneki. Touka distracts Yukinori while Kaneki deals the final blow. It then ends with Touka and Kaneki wondering if Yoshimura knows that they are ghouls. It is revealed that Yoshimura too is a ghoul as he is shown eating the corpse of the ghoul activist from before.