- Birthday: February 7, 1997
- Age: 21
- Height: 148cm
- “Tapir” member
- Audition name: RisoRiso
- Previous groups: Cue☆Twinkle, De☆Ful, EMPiRE
- Previous names: Kotani Yuina / 小谷 唯奈
Originally from Saitama Prefecture, she was the eldest of three sisters. She played badminton in Junior High School.
Her favourite idol is Rinahamu (CY8ER / ex BiS)
MOVING FROM EMPiRE TO BiS:
It was announced live on stage that YUiNA would be moving from EMPiRE, to become a part of BiS as they split into two groups. During an interview with EMPiRE, she began crying when they talked about the subject.
Her last live with EMPiRE was on May 1 2018 during the groups first one man.
In the first BiS LEAGUE election, July 31, 2018, she came in 7th place, keeping her in BiS2nd. She earned 2,343 votes total.
Previously the leader/pink member of Cue☆Twinkle under the name 小谷 唯奈 / Kotani Yuina. The group disbanded August 26, 2014.
Just 3 days later on August 29, 2014 a new group was formed named De☆Ful. On the group’s Twitter, it was announced March 10, 2015 that YUiNA and the other member were going to graduate on April 8. However, on March 22 a statement was released that both girls didn’t show up and could not be contacted. Due to this, the group immediately disbanded.
She applied for the 2017 WACK audition, but was eliminated on day 5. She was later called back to be placed into EMPiRE for their debut.