The lead male of the hentai manga Slut Girl. He is a sappy virgin from the country who becomes the boyfriend/benefactor of Sayoko Bizen.
His first appearance was in Slut Girl Volume 1 CH. 1 "Sayoko Puts Out", which was changed into Chapter 2 for the U.S. release of the series. In the original Japanese production, Satoru was named 津軽 (Tsugaru). It's unknown why this change was made by for Eros Comix version.