Adventuring a world with a system

So far this fanfic is a seriously way to close call to plagiarism. In fact it is plagaraism. The author of this book has changed less than a handful of things, and some of the things he has changed should have potentially changed the story greatly, however he is practically copying the story word for word 19 chapters in. One of the changes being that he attained 5th rank acolyte potential, however still being treated as a third rank. Considering the potential between 2 are astronomically different, this is extremely unlikely. Also I checked the aptitude test chapter for both the original and this "fanfic", they are literally word for word.