Sayoko Nakajima「中島小夜子」was born in 1970. She is also known under alias Hikaru Koenji and is a former actress that enjoyed a brief but memorable career in pinku-eiga and AV from 1988 to 1990. Appeared in many "school girls and SM works". Known for her mysterious and cute combo, she performed in some famous pinku eiga director films such as Takahisa Zeze and Hisayasu Sato. Recieved 2nd Pink Grand Prix New Actress Award. Retired around 1990.