The NH First class lounge in Narita I have been to is in the satellite. You won't find much food on offer, some onigiri,sembei, and some cheese. It isn't a horrible lounge, it's just not up to par with major First lounges around the world in it's offerings. That said when NH and most of the *A airlines(except NZ) move to NRT 1, look for a much better offering from them (I believe it is in the late spring).

There are many discussions on the NH forum about the Signet and Club ANA lounges in NRT 2........