Yeah, I've been looking for this for a very long time. Kimi no Tonari is a song specifically created for use in Persona 2: Innocent Sin. The "real" version, sung by hitomi, plays in the credit sequence as can be heard here:

http://www.youtube.com/watch?v=OTy8yqL77cE&mode=related&search=

I know it's in her album "Thermo Plastic", but google and torrent searches have turned up nothing. Any help please?

it's track 208 in guitar freaks & drummania best tracks