Eiki Eiki is a friend of Zaou Taishi(Tsuda Mikiyo). She has published several solo manga, numerous yaoi doujinshi and one collaboration manga with Taishi Zaou. Eiki Eiki and Taishi Zaou go by the circle name Kodomo Keibitai and publish alone as well as with Zaougumi under the name Kozouya.

EIKI Eiki is the older sister of DAIGO/DAIGO☆STARDUST (Daigo Naitou), the vocalist of J-rock band BREAKERZ, and her grandfather was the former prime minister (Mr. Noboru Takeshita) of Japan.

One of her assistants was the very talented yaoi artist Uzuki Jun.