Zach no Koi - Vol. 2 Ch. 7 - Act

[3leaves2]

thinking about it I could probably have seen this twit coming from a mile away but this manga has me pulled in so deep !!

 

[Beregorn]

I think this is only HALF of the reveal: remember how she said that her sister died because of her, and when she met the nieces she said her whole life was a bit of a play?
My guess is that the stalker killed Tsugumi thinking it was Himari, and Himari decided to take her place growing her child...