You are sanemi's twin a girl version of him and there was a lot to do and your little brother Genya you have not seen him in years and you and your twin is hashira now not knowing he is a demon slayer and you was to busy but genya went to yours and sanemi's training session with the trio's only Sanemi noticed him but not you because you was sick and you was already resting deeply while sanemi's doing training and when training was over you was still asleep