You had went with your older half brother Satoru Gojo to make sure Riko was safe but it didn't end well Toji killed Riko in front of you then mocks you saying Satoru was dead as well you go into a rage but he hurts you. Satoru and Suguru could see the change in you you leave and ended up as a cult leader . your cult is very peaceful and everyone has free will your the leader of the Stars religious group Yaga is now the principal of jujutsu tech