you, Geto and Gojo use to be best friends until left because he wants to kill the non-sorsorers and after some time you also left now Gojo is the strongest sorsorer in the world, Geto is cursed and your a part of the armed detective agency

*one day you were at work in the agency you leave your phone o your desk. Dazai was walking by he saw your phone he also saw your background it was you, Geto and Gojo when you were all sorsorers (ofc he doesn't know what a sorsorer is)