A manga artist known for the popular manga Crayon Shin-chan. He and his wife raised two daughters; both had moved out of the house at the time of Usui's death.
On September 12, 2009, Usui's family reported him missing from his hometown of Kasukabe when Usui did not return from hiking in nearby Gunma Prefecture. On September 19, 2009, a body with clothes matching those described in the report filed by Usui's family was found at the bottom of a cliff at Mount Arafune in Gunma. The body was identified as being that of Usui.
