TL

Y/N and Katsuki met during their last year at Aldera Junior High, Katsuki had been friends with Yumi Nanami almost all his life until he met Y/N. After he and Y/N met he started mainly hanging out with her, then once Y/N and Katsuki got into U.A, Katsuki literally forgot about Yumu and ended up blocking her completly during his third year after his social media training told him he should be careful with who he follows and what he does online.