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 Backwards-Kiva: Queen of the Demonic Castle
Kamen Rider Kiva: King of the Castle in the Demon World
Kamen Rider Den-O & Kiva: Climax Deka
Yunagi City, Sakura Country
The Serialist
Girl's Blood
Ultraman Ginga S the Movie: Showdown! The 10 Ultra Warriors!
Happy Landing
Yakuza Ladies Neo
Ultra Fight Victory
Punch the Blue Sky
Tales of Terror: Final Night 2
Kaidan Shin Mimibukuro: Dai Go Ya
Grand Guignol
Innocent Lilies: The End And The Beginning
Hobonichi no Kaidan: Vol 1
Tales of Terror: Final Night 1
Kamen Rider
Mother at Fourteen
Pretty Guardian Sailor Moon
Great Selection Taxi
Sailor Zombie
Gourmet Detective Goro Akechi
Nikenme Dou Suru? ~Tsumami no Hanashi~
Hatsukoi Geinin
Nile Perch Girls' Association
Ultraman Ginga S
Kamen Rider Backwards-Kiva: Queen of the Demonic Castle
Kamen Rider KIVA
三代目明智小五郎
ISHIKO and HANEO: You're Suing Me?
Kamen Rider Kiva
