東京國際動畫博覽會
Having begun scriptwriting at a young age and writing scripts for various companies, Satō later focused his attention on writing for anime series. The first major series he worked on was the groundbreaking 1998 Sunrise series "Cowboy Bebop", after which he worked on other well-known series, such as "" and "Wolf's Rain". 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.