His more notable works include writing the first three games of the Final Fantasy series.
He also worked on Batman: Dark Tomorrow, created the concept for the Sega CD game Dark Wizard, and was the series organizer and main script writer for the Kimagure Orange Road series among other things.
In 1978, he became an assistant for artist Osamu Tezuka, and in 1980 he became a freelance writer and director for various projects, including writing the scripts for Baoh, Dirty Pair, and Kimagure Orange Road.
He also did some work for Square, writing the scripts for the first three Final Fantasy video games.
He remained a script writer for films and animation until 2003, when he served as both the writer and director for the video game Batman: Dark Tomorrow, as well as the director for the Firestorm anime series.