[foducool]

you unzipped the file in the original work's directory ?
It might be for anormal fairy tails vol 1. In this case, the work contains 2 stories in 2 seperated folders, you have to put the patch in the folder containing the folders containing the pics

and to answer your question, it's that way because the patch images only consist of masks and text to be superposed to the original text images
if it's showing you this, it's because you didn't put the patch where you should have or the directory containing the text images is missing