Around an unknown time as well, Yamori had became the founding inspiration for the future group known as the White Suits. At some point in time, he was attracted to the preachings of ghoul supremacy by the One-Eyed King and he and Naki ended up joining the newly formed Aogiri Tree and Yamori ended up becoming an executive at some point in time. One day, Yamori ran into Naki and he fought him only to beat and spare Naki and he took him under his wing. After he got out, he remembered what he went through and decided to use the same torture methods on ghouls and he ended up torturing countless ghouls and ended up building a reputation of fear to the point of being referred to as Jason. In order to escape the pain he was going through, he pretended that he was the torturer and one day when he broke free, the roles were reversed and he felt a thrill that he had never felt before and did great harm to his former torturer. He then fled but was then captured by the CCG and was taken to the Cochlea jail in the 23rd Ward when he was captured.ĭuring his time in Cochlea, Yamori was constantly subjugated to torture constantly by a sadistic prison guard known as Goumasa Tokage to have him reveal information about the 13th Ward which Yamori knew about but he was also tortured for Tokage's pure sadistic pleasure. Yamori had fought Fura and was about to kill him when Arima took his two quinques and impaled Yamori in his backside and left him severely injured.
One night, Minami and Yamori had ambushed Taishi Fura and Kishou Arima in an abandoned building. He then became a criminal and became a member of a small team with Sumiharu Katou and Uruka Minami. Not much is known about Yamori's life other than that he was born in Tokyo and had lost his mother at some point in time.