>>48906862Uh, it was explicitly stated in their introduction that they are brother and sister. The brother does try to impersonate his sister but fails miserably in the anime while the sister successfully impersonates her brother in the non-canon video games. She has mixed feelings on it because on one hand she was able to help her brother by standing in for him but on the other hand it turns out that she is boyish enough to really make people believe that she is a boy, something which displeases her as a girl.