Having begun scriptwriting at a young age and writing scripts for various companies,[1] Satō later focused his attention on writing for anime series.

In 2005, Satō was the chief writer of Psalms of Planets Eureka Seven, for which he received an award for best screenplay at the Tokyo International Anime Fair in 2006.

[2] In 2006 and 2007, Satō worked on the Sunrise OVA series Freedom Project (which featured director Katsuhiro Otomo).

Satō also created his own consultant company, Frognation, with two of his acquaintances, which incorporated he and his friend Kengo Watanabe's own electronic music label Frogman Records.

In 2007, after leaving Frognation, Satō established his own company Storyriders.