@黑翼天使: Mix of Jinki / Jinki:Extend and Jinrouki Winvurga (can't tag).
I also have a hard time believing this is the actual Secret Collection+. Like P5 is straight up taken from the JINKI X book, P6 from X-4, and all the file names and sizes are all over the place... You got an actual sample_ in there. These are *booru, imageboard and.. Toranoana? filenames.
Edit: The rest save the first few are from the other artbooks. This gallery's a fraud.