I really love how much the author got right on her first try on this story. When i watched the movie adaption of the full manga/read the original manga I always thought the first act was sort of a great story on its own. And seeing how she delivered this very impactful story, and then continue it amazingly in the full manga is no short of impressive. Both feel natural in their ending and continuation. I always recommend a fan of the full manga to read this one-shot once. Yes they are very similar but to a big fan, the little differences make it worthit.