For a long time i figured he was a Pax Softnica employee, but it turns out he was a TV Screen Writer in Japan that Nintendo hired directly to work for the company.

http://oni.skr.jp/terui.html

1. Terui a TV Screen Writer, was approached by Miyamoto directly to create the backstory for "The Legend of Zelda" and then to work Famicom Folk Tale: Yuyuki and Time Twist.
2. Terui was the Concept Creator, Director, and Screen Play Writer for Yuyuki and Time Twist.
3. Miyamoto previously approached other anime artists / writers for Nintendo work.