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Mori Saki (森咲樹) is a former member of Hello Pro Egg. She is also a former member of the group Up Up Girls (Kakko Kari).


Mori Saki, November 2019

Mori Saki, November 2018

Mori Saki, June 2018

Mori Saki, November 2017

Mori Saki, August 2017

Mori Saki, April 2016

Mori Saki, September 2015

Mori Saki, November 2014

Mori Saki, June 2014

Mori Saki, August 2013

Mori Saki, April 2013

Mori Saki, January 2013

Mori Saki, October 2012


In 2004, Mori successfully auditioned for Hello Pro Egg alongside 29 other girls.


In January, after Arihara Kanna graduated from Hello Pro Egg and Tomoiki Ki wo Uetai to join ℃-ute, Mori was added to Tomoiki Ki wo Uetai.

In September, Tomoiki Ki wo Uetai released "Minna no Ki", making it the only single within Hello! Project to feature Mori as a Hello Pro Egg member.


From November 3 to 11, Mori participated in the stage play Reverse! ~ Watashi no Karada Doko Desu ka? starring Berryz Koubou.


From March 12 to 20, Mori starred in the stage play Nakano Blondies as the character Kit.


From July 22 to 27, Mori starred in the stage play Nekome Club 2 as the character Tsuwabuki Karin.[1]


From March 19 to 24, Mori participated in Kin'iro no Corda the Musical as one of two actresses who'll play Hino Kahoko.

From June 11 to 27, Mori participated in Fashionable, Morning Musume's annual musical, as a minor character.

In late 2010, Mori auditioned for Morning Musume 9th Generation Audition, but failed.


On January 17, it was announced that Mori had completed her Hello Pro Egg training.[2]

On February 22, a K-Pop cover dance group called UFZS was formed with Mori, Furukawa Konatsu, Sato Ayano, Sekine Azusa, and Arai Manami.

On March 3, it was revealed that Mori, along with Sengoku Minami and the other members of UFZS, will be members of a new group called Up-Front Girls (Kakko Kari).

In October, it was announced that Mori along with fellow Up Up Girls (Kakko Kari) member Sengoku Minami would form part of the unit Reborn Eleven and participate in the stage play Reborn ~Inochi no Audition~.

Mori starred in the movie Cheerfu11y as the character Yoko. The movie was released on October 10.

Mori also starred in the movie Ousama Game as the character Ishii Satomi. The movie was released on December 17.


Mori had a small role in a two-part horror movie titled ADA. It was directed by Shiraishi Koji and was released on July 13.


On November 10 and 11, Mori appeared in the stage play Gakuya ~Makenki~ alongside Takahashi Ai and other former Hello! Project members.[3]


On January 12, Mori and former ℃-ute member Nakajima Saki were appointed the "GOTO Satoumi" ambassadors of Shinkamigoto, which occupies the northeastern Goto Islands in Nagasaki Prefecture. They were chosen to promote tourism to the area, as well as carry out environmental activities.[4]

On August 27, Mori was also appointed as a migration PR ambassador for Shikokuchuo, Prefecture alongside ANGERME member Takeuchi Akari.[5]


On October 10, it was announced that Mori Saki's birthday event on October 12 was cancelled due to Typhoon No.19 (Hagibis), and a replacement event was held on October 15 at Pacific Heaven instead.[6]

On December 27, she opened up her own fitness training YouTube channel.[7]


On February 21, Mori Saki revealed through the Up Up Girls (Kakko Kari) Official Blog that she has Polycystic ovary syndrome (PCOS). In 2019, she had no menstrual periods for about six months, and had consulted with an obstetrician and gynecologist about it, who diagnosed her with PCOS. In her blog post, she shared more details about her condition and how she was dealing with it, and addressed the taboo of discussing periods for idols.[8]

On October 23, it was announced that Furukawa Konatsu, Mori Saki, Saho Akari, and Arai Manami would be graduating prior to the start of the group's new system, leaving Sekine Azusa as the sole remaining original member. The group would hold a final live event as five titled "Up Up Girls (Kakko Kari) FIVE SOUL FOREVER" on December 17 in Zepp Tokyo and a farewell party, which was being planned.[9] Of the graduating members, only Mori Saki plans on retiring from the entertainment industry.[10]

On December 26 and 27, the graduating members held a private graduation ceremony event titled "Up Up Girls (Kakko Kari) Sotsugyou Ceremony ~Tabidachi no Aisatsu~".[11] On December 27, there was also a graduation ceremony which featured all five members, titled "Up Up Girls (Kakko Kari) 5-ri no Sotsugyou Ceremony ~Tabidachi no Aisatsu~".[12]

On December 31, Furukawa Konatsu, Mori Saki, Saho Akari, and Arai Manami officially completed activities with Up Up Girls (Kakko Kari) after performing at the annual year-end Momoiro Clover Z Uta Gassen concert.[13][14] Afterwards, Mori Saki left both YU-M Entertainment and UP-FRONT CREATE, and retired from the entertainment industry.[15][16]


  • Hobbies: Collecting ribbons, sleeping, shopping, seeing various talento's blogs, watching people
  • Specialty: Typing fast
  • Least favorite food: Mushrooms, cream, crayfish, carrot
  • Favorite color: Pink
  • Favorite flower: Osmanthus
  • Likes: Ribbons, her mom's cooking, shopping
  • Dislikes: Bugs
  • Looks up to: Tsugunaga Momoko

  • Works[]


    • [2011.10.22] Cheerfu11y (チアフリー)
    • [2011.12.17] Ousama Game (王様ゲーム) (as Ishii Satomi)
    • [2013.07.13] Ada ~ADA~ (讐 ~ADA~)

    TV Programs[]

    • [2011.03.02–30] R no Housoku (Rの法則)
    • [2011–2015] Up-Front Girls
    • [2014–2019] The Girls Live


    Reverse! ~Watashi no Karada Doko Desu ka?~

    • [2007.11.03-11] Reverse! ~ Watashi no Karada Doko Desu ka? (リバース!~私の体どこですか?~)
    • [2008.03.12-20] Nakano Blondies (中野ブロンディーズ)
    • [2008.09.13-15] Tsunku THEATER dai 6 dan "Aa joshi gassho bu ~Eiko no kake ra 2008~" (つんく♂THEATER第6弾 「あぁ 女子合唱部 〜栄光のかけら2008〜」)
    • [2009.07.22-27] Nekome Club 2 (猫目倶楽部2)
    • [2010.03.19-24] La Corda d'oro Stella Musical (金色のコルダ ステラ・ミュージカル) (as Hino Kahako)
    • [2010.06.14/17/25] Fashionable
    • [2011.03.08-17] Aru Jii-san ni Sengou wo (あるジーサンに線香を)
    • [2011.10.08-17] Reborn ~Inochi no Audition~ (リボーン~命のオーディション~) (as Akechi Mitsuhide)
    • [2015] Gakuya ~Makenki~ (楽屋〜負けん気〜)
    • [2019] Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ (daily guest role)

    Select Concerts[]

    • [2006.06.14] Tokito Ami Hatsu Live '06 Haru ~The Nakano Sampler~ (時東ぁみ初ライブ '06春 ~ザ・中野サンプラ~)
    • [2007.02.10] Country Musume LIVE2006 ~Shibuya des Date~ (カントリー娘。LIVE2006~Shibuya des Date~)
    • [2007.09.22] Hello Pro Egg Delivery Station! 01 (ハロプロエッグデリバリーステーション!01) (with Kikkawa Yuu, Ogawa Saki, Kitahara Sayaka, Aoki Erina)


    • Eats raw eggs and rice for breakfast.
    • Has a younger brother.
    • When she was in Hello Pro Egg, she was the tallest. She was the tallest member of Up Up Girls (Kakko Kari) until her graduation.
    • She formerly held the title of the tallest member of Hello Pro Egg ever at 165cm. This record was broken when Mashiro Kana joined in 2013 at 168cm in height.
    • Her favorite place is her bedroom.
    • In November 2011, she was accepted into a university.
    • Took part in the second idol wrestling event produced by Tsunku, "Dai 2 Kai "Shinken Onna no Jin The☆ Killer Contents!", on December 29, 2011.
    • She is currently learning French. She often uses the language to communicate with French-speaking fans online.

    Honorary Titles[]

    Honorary Titles
    Preceded by
    Tallest Member in Hello Pro Egg Ever
    2007 – 2013
    Succeeded by
    Mashiro Kana


    1. Official Gekijyo Page
    2. ハロプロエッグ 森咲樹に関するお知らせ
    3. Official Gekijyo Page
    4. "中島早貴&森咲樹、地獄炊きうどんすすって長崎・新上五島町をPR" (in Japanese). natalie. 2017-01-12.
    5. "愛媛県西条市、新居浜市、四国中央市が、アンジュルム・アップアップガールズ(仮)出演の移住PR動画対決を行います!" (in Japanese). Hello! Project. 2018-08-27.
    6. https://twitter.com/uugirlsofficial/status/1182206640377876481?s=21
    7. "‪【森トレ】㊗︎森トレチャンネル開設!‬" (in Japanese). Mori Training (via YouTube). 2019-12-27.
    8. "PCOS*森咲樹" (in Japanese). Up Up Girls (Kakko Kari) Official Blog. 2020-02-21.
    9. "アップアップガールズ(仮)新体制に向けてのお知らせ" (in Japanese). Up Up Girls (Kakko Kari) Official News Blog. 2020-10-23.
    10. https://twitter.com/mori_saki1012/status/1319624629271420928?s=21
    11. "12/26・27 アップアップガールズ(仮)卒業セレモニー ~旅立ちの挨拶~開催決定" (in Japanese). Up Up Girls (Kakko Kari) Official News Blog. 2020-12-15.
    12. "12/27 アップアップガールズ(仮)5人の卒業セレモニー ~旅立ちの挨拶~開催決定" (in Japanese). Up Up Girls (Kakko Kari) Official News Blog. 2020-12-15.
    13. https://twitter.com/uugirlsofficial/status/1344611037299965952?s=21
    14. https://twitter.com/uugirlsofficial/status/1344654826701869058?s=21
    15. http://yum-e.jp/news/3445
    16. https://www.instagram.com/p/CJdzQKhnddZ/

    External Links[]