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Risa Yamada(山田 理沙,Yamada Risa, née Kimura, born July 9, 1965 in Shinagawa-ku, Tokyo, Japan), better known by the pen name Yun Kōga(高河 ゆん,Kōga Yun) is a female Japanese manga artist. She is married to fellow manga artist Tatsuneko. She is a graduate of Mita Senior High School, Tokyo. She currently lives in Setagaya-ku, Tokyo, and also has a daughter.
She began her career as a dōjinshi artist creating dōjinshi for works such as Saint Seiya, Captain Tsubasa and Maōden.
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, Fūma no Kojirō, 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(天使庁). She has also worked as an illustrator on the noted literary magazine Faust.
In 2007, she contributed the character designs to the Sunrise anime series, Mobile Suit Gundam 00.
Unfinished/current works
Loveless (LOVELESS) 2001–
Riddle Story of Devil (Akuma no Riddle) 2012–
Tenshichou (天使庁) 2002–2007
Kill Me (KILL ME) 2003–2006
Satou-kun to Tanaka-san -The blood highschool (佐藤くんと田中さん -The blood highschool) 2007–
ISBN 978-4-7580-5601-4
Completed works
Earthian (アーシアン) 1987–1995
Saffron Zero Beat (サフラン・ゼロ・ビート) 1988–1991 ISBN 978-4-403-61326-5
Kodomotachi wa Yoru no Juunin (子供たちは夜の住人) 1988–1990
ISBN 978-4-253-15621-9
ISBN 978-4-253-15622-6
Rōrakaizā (ローラカイザー) 1988–1993
ISBN 978-4-253-07542-8
ISBN 978-4-253-07543-5
ISBN 978-4-253-07544-2
ISBN 978-4-253-07491-9
REN AI - Renai - (REN-AI 恋愛) 1989–1999
ISBN 978-1-929090-92-1
ISBN 978-1-929090-93-8
ISBN 978-1-929090-94-5
You're My Only Shinin' Star (You're My Only Shinin' Star 君はぼくの輝ける星) 1989–1990 ISBN 978-4-06-360740-6
Kiga Ichizoku (飢餓一族) 1992–1993 ISBN 978-4-05-600065-8