A precocious, hyperactive, 12-year-old typical Osakan boy. He has a huge passion for collecting, Role-playing games, sci-fi, dinosaurs, guns and visual novels. Sasshi's family used to run the local bathhouse, the Turtle Bath, but was forced to give it up and move out due to redevelopment plans for the Abenobashi Shopping Arcade area. Sasshi spends his lazy days hanging out with his best friend Arumi. While visiting each world, Sasshi is quick to learn the gimmick behind each one, and eventually begins playing by the world's "rules". It is strongly hinted he has feelings for Arumi, and is prevented them from going back due to the fact she will leave for Hokkaido.
Voiced by: Tomo Saeki (Japanese), Luci Christian (English)