I can't really make much the vocal credits, but I do see Ako Matsudaira's name in the bottom right. The credits there look to me like:
Composition:
Ako Matsudaira: 2, 5, 8
Face Sound Team (フェイス・サウンドチーム): 3, 4, 7
Arrangement: Haward Killy (ハワード・キリー): 2, 3, 4, 5
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