Pure Sound's homepage has a news entry for
some album based on Idol Hakkenden, a Kyohei Sada game, and it says that Kiyohiro Sada participated in the game (although all the music on the disc is by Tomoo Misato).
Quote:
当社代表、禎清宏が、かつて開発にたずさわったファミコンソフト『アイドル八犬伝』(1989)の音楽CD が
HOEHOE RECORDSさんから発売されました!
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There's another entry that just mentions the existence of the
second Natsume compilation album by Clarice Disk, and the games Idol Hakkenden, Abadox, and SCAT are all name-dropped. Those are all Kyohei Sada games.
So there's that.