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In 2011, Masaki participated in the 10th generation auditions for Morning Musume. Throughout September, she appeared weekly on the TV show Hello Pro! Time in the segment dedicated to the auditions.
On September 29, 2011, at a concert at Nippon Budokan, which was part of Morning Musume Concert Tour 2011 Aki Ai Believe: Takahashi Ai Sotsugyō Kinen Special, it was announced that Masaki Sato passed the auditions alongside 3 other girls: Haruna Iikubo, Ayumi Ishida, and Haruka Kudo.
Hello! Project groups and unitsEdit
- "Pyoco Pyoco Ultra" (January 25, 2012)
- "Ren'ai Hunter" (April 11, 2012)
- "One Two Three / The Matenrō Show" (July 4, 2012)
- "Wakuteka Take a Chance" (October 10, 2012)
- "Help Me!!" (January 23, 2013)
- "Brainstorming / Kimi Sae Ireba Nani mo Iranai" (April 17, 2013)
- Hello! Project Mobekimasu
- "Busu ni Naranai Tetsugaku" (November 16, 2011)
- Sūgaku Joshi Gakuen (January 11, 2012 — March 28, 2012) as Rion Miyamasu
- Hello Pro! Time (ハロプロ!TIME?) (September 2011 —)
- Morning Musume Concert Tour 2011 Aki Ai Believe: Takahashi Ai Sotsugyō Kinen Special (コンサートツアー2011秋 愛BELIEVE～高橋愛 卒業記念スペシャル～?) (September 2011)
- Hello! Project 2012 WINTER Hello☆Pro Tengoku ~Rock-chan~
- Hello! Project 2012 WINTER Hello☆Pro Tengoku ~Funky-chan~
- Morning Musume Concert Tour 2012 Haru: Ultra Smart (February 18, 2012 — May 13, 2012)