Mutsumi Kawato (川人 睦, Kawato Mutsumi; 1979 – August 13, 2013), better known by his pen name Jun Sadogawa (佐渡川 準, Sadogawa Jun), was a Japanese manga artist from Tone, Ibaraki, Japan. His debut work Muteki Kanban Musume was published from 2002 to 2006. Sadogawa committed suicide by hanging on August 13, 2013, at age 34. He was serializing his manga Amane Atatameru at the time of his death.
Source: “Jun Sadogawa”, English Wikipedia (CC BY-SA 4.0), excerpt