Yamabuki Saaya is a second-year student at Hanasakigawa Girls' High School and the drummer of Poppin'Party. She became good friends with her classmate Kasumi during their high school entrance ceremony, and since then they often eat lunch together 

A kind, empathetic and hardworking person who cares deeply about her friends and family, Saaya often lends an ear to Kasumi and Rimi. She is generally level-headed and easygoing, and is like an 'older sister' to the other girls, always willing to help them out in hard times.