Ken Kaneki has finally come to accept the monstrous, flesh-craving part of himself that he has feared and despised for so long. After escaping captivity and torture, Kaneki joins Aogiri Tree—the very militant ghoul organization that had abducted him, leading his friends to question his true motive and loyalty.
As tension between the government and the ghouls continues to rise, the Commission of Counter Ghoul, the government's specialized anti-ghoul agency, has intensified their efforts to completely purge Tokyo of ghouls. This threatens the transient peace of Kaneki's friends and former comrades—the ghouls at the Anteiku coffee shop. Aware of the dangerous situation, Kaneki faces several battles that puts his precious fleeting humanity on the line.
Summary taken from: MyAnimeList