
Koike started a junior idol career with the DVD Big Brother at age 10, when she was in 4th grade. Koike Rina played Sailor Luna in the 2004 live-action version of Sailor Moon, Pretty Guardian Sailor Moon. She also played the role of Shizuka on the 2008 Kamen Rider Series, Kamen Rider Kiva. In early 2011 she starred in the short TV drama Onegai Kanaete Versailles, alongside visual kei metal band Versailles. After graduating from Asia University in 2016, Koike took a two-year break from the entertainment industry to spend time studying English in New Zealand and Australia.

Kamen Rider
TV • 1971

Nikenme Dou Suru? ~Tsumami no Hanashi~
TV • 2017

Pretty Guardian Sailor Moon
TV • 2003

Ultraman Ginga S
TV • 2014

Great Selection Taxi
TV • 2014

Gourmet Detective Goro Akechi
TV • 2020

ISHIKO and HANEO: You're Suing Me?
TV • 2022

Kamen Rider Kiva
TV • 2008

Girl's Blood
MOVIE • 2014

Sailor Zombie
TV • 2014

Spiritual Teacher, Kyoko Odagiri
TV • 2010

Mother at Fourteen
TV • 2006

Ultraman Ginga S the Movie: Showdown! The 10 Ultra Warriors!
MOVIE • 2015

River's Edge Investigative Agency Okawabata
TV • 2014

Nile Perch Girls' Association
TV • 2021

Kamen Rider Den-O & Kiva: Climax Deka
MOVIE • 2008

Hatsukoi Geinin
TV • 2016

DREAM STAGE
TV • 2026