Mutsumi Kawahito (川人 睦 Kawahito Mutsumi?, 1979 – August 13, 2013), better known by his pen name Jun Sadogawa (佐渡川 準 Sadogawa Jun?), was a Japanese manga author from Tone, Ibaraki, Japan. In 2000, he won an honorable mention in the 55th Weekly Shōnen Champion Newcomer Award, sponsored by Akita Shoten, for his work Twin Burner. His debut work Muteki Kanban Musume was published from 2002 to 2006. Sadogawa committed suicide on August 13, 2013 at age 34. He was serializing his manga Amane Atatameru at the time of his death.