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佐藤優樹 (Sato Masaki) is a Japanese pop singer. She is a former idol under Hello! Project as a 10th generation member of Morning Musume., as well a former member of the SATOYAMA movement units Harvest, Jurin, and Sato no Akari. She graduated from both Morning Musume. and Hello! Project on December 13, 2021 due to health issues. As of April 2022, she is part of the M-line club.
Hello! Project 2013 Summer COOL HELLO! ~Sorezoore!~2013
Morning Musume.'19 DVD Magazine Vol.1232019
Hello! Project 2013 Summer COOL HELLO! ~Mazekooze!~2013
Hello! Project 2014 Hina Fes ~Full Course~ Main Dish wa Morning Musume.'14 Desu.2014
Hello! Project 2017 Summer ~HELLO! MEETING~2017
Hello! Project 2017 Summer ~HELLO! GATHERING~2017
Hello! Project DVD Magazine Vol.392013
Hello! Project DVD Magazine Vol.672020