Definitely a revenge plot by the rapist daughter. She is one of those "planner" type character.
Also, did the mom know about the rapist had a daughter?
Calm down... this isn't a josei manga.Romance 😭 😭 😭
You sound pretty sure, is this an adeptation or something? Or are you pulling these out of thin air?for all you doomers and tragedy looking sickos, this is about ATONEMENT she wont kiull him and she wont kill his mother either, its not about a sick killing spree or revenge either, there is a ton of thoses so look for that elsewhere