The major point of this story is that the main protagonist gets uprooted by his sister, and she tries to go the full haram route. His disdain for her and the world at large causes him to try and interfere with her while 'justifying it' as correcting the world to how it was in game.
The novel makes her seem disgusted with her brother, and she doesn't realize he's here in the new world. She just thinks he's a trash mob that keeps interfering.