Yun Kōga(高河 ゆんKōga Yun, real name: Risa Yamada 山田理沙 Yamada Risa, née Kimura) is a Japanese mangaka, born on July 9, 1965 in Shinagawa-ku, Tokyo, Japan. Her blood type is B, and she is married to fellow mangaka Tatsuneko. She is a graduate of Mita Senior High School, Tokyo. She currently lives in Setagaya-ku, Tokyo, and also has a daughter.