Haise Sasaki is Kaneki Ken's name in the last Tokyo Ghoul Season. Haise Sasaki, a Rank 1 Ghoul Investigator who served as the mentor of the CCG's Quinx Squad. His memories were initially lost to him, but regained during the Tsukiyama Family Extermination Operation. Six months after the operation, ghouls came to know him by the moniker of the Black Reaper.