It is a manga series by Sui Ishida.. A 12-episode anime television series adaptation by studio Pierrot aired on Tokyo MX between July and September 2014 and a 12 episode second season titled Tokyo Ghoul √A, started airing on January 8, 2015.
The opening theme song is "Unravel" by TK from Ling Tosite Sigure, and the ending theme is "Saints" (Seijatachi) performed by People In The Box. Funimation has licensed the anime series for the streaming distribution and home video in North America.