It will be fine. As an adaptation there will of course be quite a bit dropped as compared to the novels. The main storyline about the parasites and Lina being sent to Japan to track them down should be easy to adapt. There's lots of action scenes, from the initial battle between Lina and Alfred Fomalhaut through the climactic battle at the end. I especially look forward to the Miyuki vs. Lina battle. Political scheming doesn't really show up until the very end, and it's not particularly hard to follow.