|Sato Masaki (佐藤優樹)|
May 7, 1999 (age 18)
- Name: Sato Masaki (佐藤優樹)
- Nicknames: Masaki (まさき), Maa-chan
- Birthdate: May 7, 1999 (age 18)
- Birthplace: Hokkaido, Japan
- Bloodtype: A
- Hello! Project Status:
- 2011-09-26: Member
- 2011-09-26: Morning Musume Member
- Up-Front Agency Status:
- 2011-09-26: Member
- Months in Morning Musume: 5 years
- Morning Musume Color: Teal
- Hobbies: Playing drums, riding horses
- Special skills: Ballet and playing piano
- Favorite food: Soba, udon, plum sheets
- Favorite color: Yellow and green
- Charm Point: Eyelashes
- Motto: "Don't be noisy"
- Favorite word: "Deshou"
- Favorite Morning Musume song: "Maji Desu ka Ska!", "Fantasy ga Hajimaru"
- Looks up to: Takahashi Ai, Niigaki Risa
- Hello! Project groups:
Sato Masaki was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, 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.
Singles Participated InEdit
- [2011-2012] Hello! Pro TIME (ハロプロ！ＴＩＭＥ)
-  Suugaku♥Joshi Gakuen (数学♥女子学園)
-  Michishige Sayumi no "Mobekimasutte Nani??" (道重さゆみの『モベキマスってなに？？』)
- [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～)
- [2012.07.11] Greeting ~Sato Masaki~ (Greeting 〜佐藤優樹〜)
- [2012.09.10] Morning Musume Kyuukies & Juukies 1st official Photo Book (モーニング娘。9・10期 1st official Photo Book)
- She is the sixth Morning Musume member to come from Hokkaido.
- In elementary school, she was called Maasa alot because of her name Masaki, and her resemblance to Sudo Maasa from Berryz Koubou.
- She has played the piano since she was two.
- 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.
- Considers her charm point to be her eyelashes.
- Her mom is a huge fan of Morning Musume.
- She, along with Kudo Haruka, are the youngest members 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 along with 9th generation member Fukumura Mizuki are the only two Morning Musume members to be left handed.
- She believes she can't lose at having perfect pitch.
- Calls her father "Chichi" instead of "Papa" or "Otousan".
- Said that her friends give her the energy through out the day and that they make her smile.
- She has the same birthday as 5th generation member Konno Asami and former Hello! Pro Kenshuusei member Maeda Irori.
- Konno Asami and her both come from Hokkaido, and the two have been said to look similiar.
- She has said that if she were not a member of Morning Musume, she would want to be a piano teacher.
- She spoke English until she was five years old, when she began kindergarten, and had to start using Japanese.
- She said that she grew up watching Disney Channel shows in English, and still does (despite no longer understanding the language).
- She usually forgets and stumbles on speaking lines on stage.
- She is the second 10th generation member to get a solo DVD.
- When asked what aspect of her makeup she is most particular about, she said she rarely wears makeup so she does not know.
- Is known to be affectionate with fellow members, particularly sharing hugs with Tanaka Reina and Michishige Sayumi.