September 3, 1993
|Birthplace||Oyama, Tochigi, Japan|
Rina started her junior idol career around the age of 10 with the DVD "Big Brother". She has also released a photo collection titled "Innocence", and has also acted in movies and TV dramas, as well as photobooks and DVDs.
Her current modeling agency is Very Berry Production.
- It is said that Koike had fun playing Sailor Luna, but she wished she could have played Sailor Chibi Moon (as her favorite color is pink).