Hikaru Koto (古都ひかる) was a JAV actress, Japanese AV idol and Gravure model who was born on 13 March 1985. She measures US 33D-22-34 (JP 85E-57-86) and is 163cm tall. Hikaru started her AV career in 2003 when she was about 18 years old. She later retired from the AV industry in 2004 but has continued her modelling career.

She is also known as:

• Cotonyan / ことにゃん
• Cotorich / ことりっち