Risa Kimura, better known by her pen name Yun Kōga is a Japanese manga artist. She is married to fellow manga artist Tatsuneko, from whom he took the name of Risa Yamada. She is a graduate of Mita Sen

Earthian is a yaoi manga by Yun Kōga. It is about angel watchers of earth which was made into a J.C.Staff-produced anime OVA. The angels' roles are to assess the progress of humans giving them positiv