Kaya have said that it is printed wrong and put the correct credits in his blog..
Lyrics by Kaya
Music by 源 依織(from cocklobin)
の欄ですが、正しくは、
All Lyrics by Kaya
Music by 源 依織(from cocklobin) (M2)
ミサ(M3)
Kei Suzuki (M1,M4)
http://ameblo.jp/kaya-rose/entry-11282577373.html