User blog comment:IamJakuhoRaikoben/Chapter 450: Alone in all the World, Review./@comment-756329-20150831122225/@comment-9595671-20150831161047

I always had a feeling that was a huge hint, especially after it was stated she stopped aging.

At the time however... I thought it was kill in a more metaphorical sense, I figured the fact she stopped aging was immortality. I was right there, but this chapter showed that was farther from the truth.