Yamabuki Saaya is a third-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 eat lunch together every day. Outside of the band, she is friends with Tomoe, whom she gets along with well because they're both older sisters and drummers, and with Moca due to her being the self-proclaimed number #1 fan of Yamabuki Bakery. She also works part-time at RiNG together with Kasumi. Saaya has slanted royal blue eyes and long, curly, dusty brown hair worn in a high ponytail, usually tied up in a ribbon. She has spread-out bangs and shoulder-length curled forelocks. In her initial outfit, Saaya wears long flowing pale yellow pants with a white, frilly off-the-shoulder top. A kind, empathetic, and hardworking person who cares deeply about her friends and family, Saaya often lends an ear to the people around her. 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. In addition to this, Saaya is the most mature member of Poppin'Party, and good at dealing with kids. Because of her kind nature, she has a hard time saying "no" to her friends or their requests, such as helping Hagumi to study.