In September 2011, Kusumi made her runway debut at the Kobe Collection 2011 Autumn/Winter Show. Beginning in the same month, she modeled exclusively for the fashion magazine "CanCam", starting from the November 2011 issue until the September 2015 issue. In 2012, Kusumi made runway appearances at the "CanCam" × "AneCan" Collaboration Fashion Show: Can Colle!, Stock Style 2012 Spring/Summer, and Girls Award 2012 Autumn/Winter shows. In 2013, she made runway appearances at the Girls Award 2013 Spring/Summer, Tokyo Girls Collection 2013 Spring Live, ReaMa Pastel Party 2013 in Tokyo Show, and Girls Award 2013 Autumn/Winter shows.