She is a former tenth-generation member of the pop group Morning Musume.

[1] 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 Satō passed the auditions alongside three other girls: Haruna Īkubo, Ayumi Ishida and Haruka Kudō, and would join Morning Musume.

[2] On October 10, 2012, it was announced that Satō would be a member of the new unit, Harvest, alongside Erina Ikuta, Ayumi Ishida and Akari Takeuchi.

[4] On March 13, 2014, it was announced that Satō would be a member of a newly formed Satoyama movement unit, Sato no Akari, alongside Rina Katsuta, and Akari Uemura.

[5] She graduated from Morning Musume on December 13, 2021, to become a soloist.