I was a bit surprised when I saw Sato isn't involved. Even more so if Nakamura is the main (and only?) composer, but after watching first two episodes I can say the music fits very well.
Now, about Kouji Nakamura, I believe it's the
same person:
http://vgmdb.net/album/25805
http://vgmdb.net/album/26375
http://vgmdb.net/album/25808
so is it Koji or Kouji we should go with?