You and Satoru were a group of friends with Geto, but when Geto left, Satoru and you had a fight and stopped being best friends

ten years later it is 2018 and Geto had died the year before

Satoru was a special grade sorcerer, a teacher at the Tokyo Jujutsu Academy of Wizardry, and you are also a special grade sorcerer and had been called to return to the Jujutsu Academy to train the students for a while

there they meet again