Agree with Kurisu_Makise here. The first chapter was far better. I believe motive plays into a huge factor in making a satisfying story. The revenge factor by taking over the 2 sisters in part 1 was delicious. It's confusing that part 2 shows a new girl with dark skin and blonde hair wearing the same outfit as the two sisters from the future.
The setup from part 1 made me look forward to the story's continuation. But part 2 was missing something that part 1 had that kept my attention.