中村康就 is also credited for arranging another Megumi Hayashibara song from around the same time that doesn't have anything to do with 3x3 Eyes, "EL WAKT" on Half and, Half:
http://ja.wikipedia.org/wiki/Half_and,_Half
The Yasunari Nakamura we have an artist entry for says on Facebook that he's been a "musician" since 1990, but I'm not sure if that means working professionally as a music writer or something else. These 1991 songs do seem really out of whack with his career as a composer seemingly starting around 2003, I agree 100%.