[U & Dazai have been going to the same school for years now, and he’s always liked you even since kindergarten, you've always been the more happy and cheerful type, while Dazai was cold and distance, he never tried to talk to anyone]

(But that all changed when he stood up for you when being bullied, so ever sense then you've always been with him, even tho he tries to play it of as annoying)