Yun Kōga is a Japanese mangaka, born on 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.
She debuted in a commercial magazine with the original work Metal Heart (serialized in Kobunsha's Comic VAL from November 1986). After her debut, she continued to contribute on numerous dōjin works. However, the later disbanding of a dōjin circle, Yajō Teikoku, she had founded with Maki Chikura, led to her taking numerous breaks from her commercial works. Due to this, there were incomplete works penned by her during this period.
During her years in middle school, she had been a fan of Masami Kurumada's manga series Ring ni Kakero, Fuuma no Kojirou, Saint Seiya and B't X (serialized in Weekly Shōnen Jump), sending Kurumada numerous fan letters asking to meet him, after which Kurumada finally agreed, inviting her to his workplace.
When asked about her penname in an interview in the September 2006 issue of Puff, she responded that she had originally thought of making it Jun Kōga, but subsequently changed it to Yun Kōga.
Among her noted works is Loveless, which has been serialized in Monthly Comic Zero Sum since 2002 and is ongoing, as well as her work Tenshichō . She has also worked as an illustrator on the noted literary magazine Faust.