His highness looks dangerous

On my way back home I find my sister playing games again this always happens everytime I'm going home. Out of curiosity i asked her what's so good playing those games.She answer with delightful and sparkling eyes and said "big brother why don't you try to play it so you will know "that what she said. she is still continue playing while she is explaining like "the villainess soon her wrong doing well revealed ""the heroine and the first love interest will married soon when the villainess is execute"with those words I'm speechless. In my mind I really want to ask her why the villainess executed but eventually I really ask her and this is what I said "when the villainess executed what did she done is it because she harassed the heroin and what the heroine did why she is being harassed by the villain's".my little sister react to what I said she said "because the villainess harassed the heroine so that's why she being executed "and that's my sister answer but that's not an answer I want. the story itself it doesn't make sense for me what I want to know is "what is the cause and what is the effect"thats what i want to hear.