Hello! Project Wiki

Kasai Yuumi (河西結心) is Japanese pop singer under Hello! Project as a member of Tsubaki Factory.


Kasai Yuumi, August 2021

Kasai Yuumi, July 2021

Early Life[]

Kasai Yuumi was born on July 30, 2003 in Yamanashi, Japan.

From 2015 through 2019, she was signed to Amuse Talent as an actress and model in their Kids' division.[1][2] Her contract expired on March 31, 2019.[3]


On July 7, Kasai was announced as one of the winners of the Hello! Project "Juice=Juice" "Tsubaki Factory" Goudou Shin Member Audition audition and would join Tsubaki Factory alongside Yagi Shiori, Fukuda Marine, and Yofu Runo.[4]

Personal Life[]

As of April 2021, Kasai is currently in her last year of high school.

Here is a list of nicknames that was used to refer to Kasai Yuumi:

  • Yuumi (ゆうみ)
  • Yuttii (ゆってぃ)
  • Yuu-chan (ゆーちゃん)


  • Name: Kasai Yuumi (河西結心)
  • Nicknames: Yuumi (ゆうみ), Yuttii (ゆってぃ), Yuu-chan (ゆーちゃん)
  • Birthdate: July 30, 2003 (2003-07-30) (age 18)
  • Birthplace: Yamanashi, Japan
  • Blood Type: O
  • Western Zodiac: Leo.svg Leo
  • Eastern Zodiac: Goat.png Goat
  • Hello! Project Status:
    • 2021-07-07: Member
  • Tsubaki Factory Member Color: Purple Colorball.png Purple
  • Hello! Project Groups:

  • Hobbies: Dancing, sleeping
  • Favorite Music Genre: J-Pop
  • Favorite Food: Peaches, ramen, and hamburg steak
  • Favorite Sport: Field hockey
  • Motto: Nana Korobi Ya Oki (七転び八起き; Fall Down 7 Times Get Up 8)
  • Looks Up To: Suzuki Airi, Asakura Kiki

  • Works[]

    TV Programs[]

    • [2016] Good Partner (Case 2)
    • [2018] Yakeni Ben no Tatsu Bengoshi ga Gakko de Hoeru (ep. 2-3)
    • [2018] Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger (ep 12)



    • She is the first member in Hello! Project history to be from the Yamanashi Prefecture.
    • She has experience in cheerleading.
    • She wants to do a Christmas gift exchange with Tsubaki Factory members.
    • She wants to be able to perform cutely.
    • Before joining Tsubaki Factory, she was previously signed with management company Amuse as a child actress.
    • She appeared as a minor character in episode 12 of TV Asahi's Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger, the 42nd Super Sentai series, which starred former Morning Musume member Kudo Haruka as Hayami Umika / Lupin Yellow.[5]
    • Her audition number was 246.[6]

    See Also[]


    External Links[]