Rina Akiyama (秋山 莉奈, Akiyama Rina, 26 September 1985–) is a Japanese actress, gravure idol, and tarento from Tokyo. Her most notable appearances are in two Kamen Rider Series, namely Kamen Rider Agito and Kamen Rider Den-O. She also has a cameo appearance in Metal Gear Solid 3: Snake Eater in which she is featured in a poster on one of the levels. She has also been named to have the "Best Buttocks in Japan" in 2007, which earned her the nickname "Oshirina", a portmanteau of the words "oshiri" (buttocks) and "Rina".

Name: Akiyama Rina, Bishiri no Jyoou
Japanese name: 秋山莉奈, "Queen of Ass"
Birthdate: 9-26, 1985
Birthplace: Tokyo, Japan
Occupation: Actress, model and singer .
Blood Type: A
Height: 165cm
Bust: 83cm
Waist: 58cm
Hips: 88cm
Hobby: Candy making
Ability: Piano

Akiyama Rina is a new upcoming R&B singer and model from Tokyo who is under the management of Stardust Music and Universal Music Japan. This 24 year old released her first single Gentleman in January 2005 and her first album Perfume earlier this summer. Akiyama Rina's new single This time was launched in 2006. Have a listen, she’s pretty good.