Credits needs a bit of verification for:
Track 15: the only place i can find Lyrics/Composer info is
here, is it "Re:versible" ?
Track 25/27:
Konami credits Kazunori Onuki [大貫和紀] & 堀田星司 for compo&arrange for the original vocal song (track 27)
while
iTunes credits Noriyuki Kamikura for track 25 (so i suppose he is the arranger) ?