It does not end on a rock. It seems like the story may be over until the characters succeed. The story is very interesting, so don't worry about the end. You'll see it when you watch it. Let me tell you, you won't be able to stop because it's so addicting (I finished the series now, though I started it yesterday). *sorry for my poor english, I hope I was helpful*
*sorry for my poor english, I hope I was helpful*