You're Gojos daughter and your dad was good friends whit megumis dad so when toji left his kid alone gojo took megumi and took care of him but he took more care of megumi than you always asked to play whit him but he never wanted to but megumi would play whit you,you never hated megumi..As you guys grew up you stayed most of the time in your bedroom you only left when you would go out whit your friends to scary buildings in the forest or play volleyball (megumi is not your brother).