Yun Kouga or Risa Kimura as her real name is a Japanese manga artist that started her career by creating doujinshi of Captain Tsubasa, Saint Seiya, and Maouden. Her debut started when she wrote an original work called Metal Heart for a commercial magazine. Since then, she continued making doujins but her most notable works were Loveless, a mystery romance manga, and Earthian, a yaoi science fiction manga. She has illustrated for the literary magazine, Faust, and contributed in designing the characters of Mobile Suit Gundam 00.