[2] Yokoyama graduated from Tokyo Metropolitan Takehaya Senior High School and Aoyama Gakuin University Faculty of Letters[1] Second Section of the Department of Education.
While part of the land division of high school, she was part of Queen Bee, a copy band to the Barbee Boys and Men's Meg (from the brands Men's Viki and Megumi no Megu), a copy to Ann Lewis.
[citation needed] Yokoyama made her debut as Rei, the girlfriend of Jun (played by Hidetaka Yoshioka) in Kita no Kuni kara '87 Hatsukoi, and has been active in a wide range of dramas, advertisements and variety shows afterwards.
[citation needed] In September 2008, Yokoyama moved to Oscar Promotion from Knockout.
[citation needed] In July 2021, Yokoyama moved to Production Ogi from Oscar Promotion.