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| Sato Masaki|
Masaki (まさき), Maa-chan
May 7, 1999
Sato Masaki was born on May 7, 1999 in Hokkaido, Japan to a couple whose names are undisclosed. She has two younger sisters.
On September 29, Sato was selected from Morning Musume's 10th Generation audition to join the group along with Iikubo Haruna, Ishida Ayumi, and former Hello! Pro Kenshuusei member Kudo Haruka. The tenth generation made their official presentation on the same day they were announced as new members in the "Morning Musume Concert Tour 2011 Aki Ai Believe ~Takahashi Ai Graduation Memory Special~" concert, and they participated in a performance of the song "Tomo". They also participated in the end of the song "Namidacchi".
On April 18, it was announced that Tanaka Reina and the 9th & 10th Generation members will participate in a new stage play titled Stacey’s Shoujo Saisatsu Kageki. The musical ran from June 6-12.
During the last few days of her first concert tour, she cut her hair short.
On May 13, information was released about an event for the 9th and 10th generation members of Morning Musume as well as S/mileage’s 2nd generation members, titled Mosuma FC Event ~Gachi☆Kira~, was set to take place on June 15th, 18th, and 20th at Yokohama Blitz.
On January 11, it was released that Sato Masaki, who has been resting since December 31st due to a high fever, has been diagnosed with left neck cervical lymphadenitis after a detailed examination. She was absent for all events between December 31st through January 17th.
On May 7, Sato will have her birthday event, titled "14-sai Nau Nau---!!" (１４才なうなぅーーー！！; 14-years-old now now---!!). Guests include fellow 10th generation member Kudo Haruka.
- Name: Sato Masaki (佐藤優樹)
- Nicknames: Masaki (まさき), Maa-chan (まーちゃん)
- Birthdate: May 7, 1999 (age 14)
- Birthplace: Hokkaido, Japan
- Bloodtype: A
- Height: 153cm
- Hello! Project Status:
- 2011-09-29: Member
- 2011-09-29: Morning Musume Member
- UP-FRONT AGENCY Status:
- 2011-09-29: Member
- 2012-10-01: Transferred to UP-FRONT PROMOTION (as part of Morning Musume)
- UP-FRONT PROMOTION Status:
- 2012-10-01: Member
- Years in Morning Musume: 2 Years
- Morning Musume Color: Emerald Green
- Hello! Project groups:
- Hobbies: Playing drums, riding horses.
- Special Skills: Ballet and playing piano.
- Favorite Food: Soba, udon, plum sheets.
- Favorite Color: Yellow and green.
- Favorite Place: Disneyland.
- Philosophy: Being Smiley
- Charm Point: Eyelashes
- Motto: "Don't be noisy"
- Favorite Word: "Deshou"
- Favorite English phrase: "Thank you!"
- Favorite Morning Musume song: Maji Desu ka Ska!, Fantasy ga Hajimaru
- Favorite Song in the Past: Butterfly
- Current Favorite Songs: Saraba, Itoshiki Kanashimitachi yo, Kokuhaku, Robo Kiss
- Looks up to: Takahashi Ai, Niigaki Risa
- See Also: Sato Masaki Discography Featured in
- [2012.07.11] Greeting ~Sato Masaki~ (“e-Hello!” DVD)
- [2012.02.24] 9+10=∞ (鞘師里保/佐藤優樹) (with Sayashi Riho)
- [2013.01.29] Alo-Hello! Morning Musume 2012 (アロハロ！モーニング娘。2012) (Masaki version)
- [2013.04.02] Alo-Hello! Morning Musume Tenki Gumi (アロハロ！モーニング娘。天気組) (Masaki version)
- [2013.04.09] Alo-Hello! Morning Musume Tenki Gumi (アロハロ！モーニング娘。天気組)
- [2012.09.10] Morning Musume Kyuukies & Juukies 1st official Photo Book (モーニング娘。9・10期 1st official Photo Book)
- [2013.01.15] Alo-Hello! Morning Musume 10ki Shashinshuu (アロハロ！モーニング娘。１０期写真集) (Morning Musume Tenkigumi)
- [2013.04.20] Michishige ☆ Photo SOUL
- [2013.12.01] Morning Musume Tenki Gumi BOOK (モーニング娘。天気組BOOK)
- [2013.10.24] Weekly Famitsu Taiwan Vol.457
Featured on the coverEdit
- [2011.12.28] Hello! Channel Vol.7 (Iikubo Haruna, Fukumura Mizuki, Ishida Ayumi, Ikuta Erina, Sayashi Riho, Suzuki Kanon, & Kudo Haruka)
- [2012.04.27] B.L.T U-17 Vol.22 (Back cover) (with Iikubo Haruna, Ishida Ayumi, & Kudo Haruka)
- [2013.01.23] Anikan R Yanyan (Back cover) (Iikubo Haruna, Fukumura Mizuki, Ishida Ayumi, Ikuta Erina, Sayashi Riho, Suzuki Kanon, Oda Sakura, & Kudo Haruka)
- [2013.04.11] Anikan R Yanyan Vol.5 (Back cover) (with Michishige Sayumi, Iikubo Haruna, Sayashi Riho, & Suzuki Kanon)
- [2013.08.25] bounce issue 358 (Back cover) (with Iikubo Haruna, Ikuta Erina, Suzuki Kanon, & Kudo Haruka)
- [2013.09.11] Anikan R Yanyan magazine Vol.9 (Fukumura Mizuki, Ishida Ayumi, Ikuta Erina, & Oda Sakura)
- [2014.01.29] Anikan R Yanyan Vol.13 (Back cover) (with Fukumura Mizuki, Sayashi Riho, Suzuki Kanon, & Kudo Haruka)
- [2011-2012] Hello Pro! TIME (ハロプロ！ＴＩＭＥ)
- [2012-2013] Hello! SATOYAMA Life (ハロー！ＳＡＴＯＹＡＭＡライフ)
- [2014-] The Girls Live
-  Suugaku♥Joshi Gakuen (数学♥女子学園)
-  Stacey's Shoujo Saisatsu Kageki
-  LILIUM -Lilium Shoujo Junketsu Kageki- (LILIUM －リリウム 少女純潔歌劇－)
-  Michishige Sayumi no "Mobekimasutte Nani??" (道重さゆみの『モベキマスってなに？？』)
-  Guest, Maachan (ゲスト、まぁちゃん。)
- [2012–] Morning Musume no Morning Jogakuin ~Houkago Meeting~ (モーニング娘。のモーニング女学院～放課後ミーティング～)
- She was voted 6th favorite member in the 2012 "Hello! Project Music Awards" event. 
- She was voted 5th favorite member in the 2013 "Hello! Project Music Awards" event. 
- She is the sixth Morning Musume member to come from Hokkaido.
- She has a very cheerful character.
- She is often tired.
- Her mom is a huge fan of Morning Musume.
- She blew a kiss during her second time on stage and called it MasaKiss.
- She is the only 10th generation member that has not had past experience in the entertainment industry.
- She and Fukumura Mizuki are the only two Morning Musume members to be left handed.
- Her best friend is Kudo Haruka.
- Her rivals are Ishida Ayumi and Oda Sakura.
- She and Suzuki Kanon are known for having perfect pitches when it comes to singing.
- She spoke English until she was five years old, when she began kindergarten, and had to start using Japanese.
- She grew up watching Disney Channel shows in English, and still watches them (despite no longer understanding the language).
- She has the same birthday as 5th generation member Konno Asami, former Hello! Pro Kenshuusei member Maeda Irori and current Hello! Pro Kenshuusei member Danbara Ruru.
- Shares the same last name with former NICE GIRL Project! Kenshuusei Sato Maria and Up Up Girls (Kari) member Sato Ayano
- She usually forgets and stumbles on speaking lines on stage.
- She is known to be affectionate with fellow members, particularly sharing hugs with Tanaka Reina and Michishige Sayumi.
- She said on a radio show that she'd like to go and see all of America.
- Both Tsunku and Oda Sakura stated in separate interviews that she is a genius.
- She is afraid of chicks, which bears resemblance to Ishikawa Rika who is an ornithophobe.
- In elementary school, she was called Maasa a lot because of her name Masaki, and her resemblance to Sudo Maasa from Berryz Koubou.
- She has played the piano since she was two and she has said that if she were not a member of Morning Musume, she would want to be a piano teacher.
- Practiced drums starting in her third year of Elementary school, but stopped two years ago as of 2012.
- Is practiced to competition level obstacle jumping in horse back riding.
- She began ballet in 2nd grade, to help her fix her posture. When she got into Morning Musume, she had already quit.