Biography
Koji Nanjo is one of the two main characters of Minami Ozaki's manga (and anime) series Zetsuai 1989 and BRONZE - Zetsuai since 1989.
There are some soundtracks which belongs to the animes of Zetsuai and Bronze where the most of the vocal parts are denoted with Koji Nanjo.
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But actual most of these songs are performed by Sho Hayami and Shinichi Ishihara. Beside these two there are also a few songs performed by Takehide and other various artists.
Biography text from Last.fm, available under CC BY-SA.