Yuumi Kasai
Also known as: Yuttii (ゆってぃー) - 河西結心 
Yuumi Kasai alias list
Yuttii (ゆってぃー) - Nickname
河西結心 - Different alphabet (Japanese)
Yuumi Kasai Biography
Personal
Age: 22 years old
Born: Wednesday 30th of July 2003
Years active: 2015-present (11 years active)
Nationality: (Japanese)
Ethnicity: Asian
Professions: Musician: J-pop Idol, Musician: Singer
Body
Hair color: Black
Eye color: Brown
Height: 5'2" (or 156 cm) (Petite)
Body type: Slim
Boobs: Real/Natural
Extra
Instagram follower count: 42k (as of May 2026)
About Yuumi Kasai
Kasai Yuumi is a Japanese idol under the Hello! Project and a member of Tsubaki Factory.
She enjoys dancing and sleeping, and her favorite music genre is J-pop. Her favorite foods are peaches, ramen, and hamburg steak, while her favorite sport is field hockey. Summer is her favorite season.
Her personal motto is “Nana Korobi Ya Oki” (七転び八起き), meaning “Fall down seven times, get up eight.” Her favorite Hello! Project song is “Nakimushi Shounen.” She also looks up to Airi Suzuki and Kiki Asakura.
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