Hello! Project Wiki
Hello! Project Wiki

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


Kasai Yuumi, November 2021

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]


On January 27, it was announced that Kasai Yuumi had tested positive for COVID-19 by PCR test. As a result, the January 29 and 30 shows of the Hello! Project 2022 Winter ~LOVE & PEACE~ tour was cancelled, and the Tsubaki Factory Kishimoto Yumeno×Akiyama Mao×Fukuda Marine FC Event 2022 ~Chou Chou Chou Nen2~ in Osaka was also cancelled.[5][6]

On August 2, she will celebrate her 19th birthday at a fanclub event titled Tsubaki Factory Kasai Yuumi Birthday Event 2022, which featured two shows at LANDMARK HALL.

Personal Life[]

She has a cat named Mimi (みみ). She calls her Mimi-chan (みみちゃん).

She graduated from high school in March 2022.

The following list are notable friendships Kasai Yuumi has acquired:

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

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


  • Name: Kasai Yuumi (河西結心)
  • Nicknames: Yuumi (ゆうみ), Yuttii (ゆってぃー), Yuu-chan (ゆーちゃん)
  • Birthdate: July 30, 2003 (2003-07-30) (age 19)
  • 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 Penlight.png Purple
  • Hello! Project Groups:

  • Hobbies: Dancing, sleeping
  • Favorite Music Genre: J-Pop
  • Favorite Food: Peaches, ramen, and hamburg steak
  • Favorite Sport: Field hockey
  • Favorite Season: Summer
  • Motto: Nana Korobi Ya Oki (七転び八起き; Fall Down 7 Times Get Up 8)
  • Favorite Hello! Project Song: Nakimushi Shounen
  • 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)
    • [2021–] Ikuze! Tsubaki Factory (行くぜ!つばきファクトリー)



    • 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.
    • 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.[7]
    • Her audition number was 246.[8]


    External Links[]