In the past she belonged to the agency Starray Production,[5] and is currently a free agent.
[6] Sayoko started off her career by modeling for Egg magazine from 2007 to 2009.
While working as an employee of Shibuya 109's "Lip Service", she became an exclusive model of the magazine Happie Nuts.
[8][9] In 2012, she took part in the fashion show Tokyo Girls Collection.
[10] Together with models Kozue Akimoto and Misaki Izuoka in 2013, she joined the fashion brand "Sly Lang".