Mari Yaguchi
In 2003, Umeda became a member of the subgroup ZYX along with Mari Yaguchi from Morning Musume, Maimi Yajima, Saki Shimizu, Megumi Murakami, and Momoko Tsugunaga. They released their debut single, "Iku ZYX! Fly High" on August 6, 2003, followed by "Shiroi Tokyo" on December 10, 2003. Later, in 2004, she participated in singing "All for One &amp; One for All!", a collaboration single released by all Hello! Project artists under the name "H.P. All Stars."