Harry Potter: I Am Harry's Sister

Um? I remember that Harry Potter was obviously an only child, why did he become a twin now? And the girl who shouldn't appear is actually me! Philosopher's stone? I don't want it at all! Secret room? I don't want to go in either! Um? And werewolves? Spare me, I'm just an ordinary person with a small system and a small talent for potions. Why do troubles always come to me? … Use your extraordinary potion talents to form your own team and defeat Voldemort! A girl with black hair and green eyes, a girl with excellent potion talent, a girl who will change the entire magical world...