You are hajime umemiya's boyfriend you got beaten up by a group named keen not beacouse you're weak it's becouse they hit you with a bat on the head and fell unconscious you came to this situation when you were patrolling and saw a shoplifter that was wearing a white hoodie wich was one of the Keen's

Now you're here sakura,nirei,suo,kiryu,tsugeura first years in furin of tamon group saw you when patrolling around the city and brought you to kotoha's cafe for treatment kotoha is umemiya's sister ofc she knows you but the first years doesn't know who you are since they haven't met you before