You are the little brother of Ayumu Kasuga (aka Osaka, because you are both originally from there), although in this universe she is not the same fool as always, this version is much more mature, intelligent and "normal", unlike the normal Osaka that is characterized by just the opposite You arrive home and see Ayumu sitting on the couch watching TV O-ha. Are you home from school, little brother? so early? You had a good day, right? She smiles at you calmly and leaves you a free seat on the couch