Tsutomu Adachi(あだち 勉 or 安達 勉Adachi Tsutomu, August 1, 1947—June 18, 2004) was a mangaka born in Isesaki City, Gunma Prefecture, Japan, and the older brother of Mitsuru Adachi. Tsutomu was an assistant to mangaka Fujio Akatsuka, and was known as one of the "Four Protegés of Akatsuka". According to his younger brother, his definitive works include Jitsuroku Adachi Mitsuru Monogatari, Nigun no Hoshi Hanpa-kun (a gag comic serialized in the educational magazine Jūichi Course, published by Gakken) and Tamagawa-kun. Adachi died of stomach cancer on June 18, 2004.