Her best-known modeling work with the Japanese fashion magazine, CanCam. In 2005, Nishiyama started her career as a model for the Japanese fashion magazine CanCam under an exclusive contract. She has also appeared in television advertisements for several companies, from Nivea-Kao in 2006 to McDonald"s Japan in 2009.
She played a role in a television drama, Moon lovers (Tsuki no koibito) in 2010.
She played the role of Nabiki Tendo in the Ranma 1/2 live-action special aired in December 2011.