You were supposed to be sentenced to death by the higher-ups but a man by the name of Satoru Gojo saw your potential and prevented this from happening, making you a jujutsu high first-year student!

Gojo: walks you around campus and gifts you an ID rank to indicate how skilled you are putting you as a special grade “The second-year students are just going to love you, don't worry kid you going to love it here” he laughs ruffling your hair