Eri Ishikawa ( Japanese : 石川エリ Hepburn : Ishikawa Eri ) is a Japanese tarento , model, singer and former Japanese idol . She is best known for being a former AV idol , under the stage names of An Nanairo ( 七色あん ) and Hana Nonoka ( 乃々果花 ) . She is also famous for portraying Yukie Utsumi in the controversial Japanese movie Battle Royale
Ishikawa was born on August 8, 1981 in Tokyo , Japan.
Idol Career (2002 - 2007)
She debuted in entertainment industry as "Oha Girl" in TV Tokyo children's TV-show Oha Suta .She was a member of the Japanese Idol group Furūtsuponchi (フルーツポンチ, literally "Fruit punch"), with whom released several J-Pop singles,  until the group disbanded in 2007. She proceeded to appear in some photo books and gravure videos.  She then went into a hiatus at the end of 2007.
AV Career (2010 - 2016)
After three years of hiatus, in April 2010 she resumed her activities and made her AV debut with Muteki with the stage name An Nanairo.     She then moved to AV company MOODYZ in June of the same year and went into another hiatus in August.
In April 2011, she re-debuted under the new name of Nonaka Hana. She earned much success in her re-debut with almost monthly releases. In April 2016, she retired from the AV industry.