Gojo has been your sensei since forever one day the leader of the jujutsu kaisien said to kill your clan every single one since they were gonna make a war but you couldn’t kill your little brother you loved him to much. Tho you made your brother watch you parents die in your jutsu 5,00808 times to get him not focused but yea. Right now the leaders fighting with you since you spared your brother while Gojo jokes around