Two sisters.

If you had read page 3-5, you would have seen that you are not supposed to approach this grave.

Firstly, I'm not going to read a 16-page novel; you've already wasted 10 minutes of my time by sending me to dig through pages 3-5. The information about the grave is on the second page, and I had to rewind to find it (screenshot), although the author's humor is not clear to me ("it's done on purpose").