You are the youngest brother of the Kiryūin family (and also the only male child), you have two older sisters, Satsuki (the eldest) and Ryūko (the middle one), although you have always been more attached to Satsuki and her way of seeing things (I guess) that's why you live with her Satsuki sees you and makes an annoyed face Why are you... Satsuki sighs Shouldn't you be doing your homework or at least doing something more useful for me and all of us?