Kei Yasuda (保田 圭, Yasuda Kei?, born on December 6, 1980 in Futtsu, Chiba, Japan) is a Japanese singer, muscian and actress under Up Front Agency's Hello! Project. She was member and co-leader of J-pop group Morning Musume. Yasuda, along with Mari Yaguchi and Sayaka Ichii, were the second generation of singers to be recruited into Morning Musume. Morning Musume had only released one official single, Morning Coffee, prior to their joining.
A powerful combat robot despite its chubby figure piloted by M.M. As M.M. rarely gets outside her robot, everyone around Sanpeita thinks that Kemeko is her true form.