Mari Yaguchi
In 2003, Murakami became a member of the subgroup ZYX along with Mari Yaguchi from Morning Musume, Erika Umeda, Maimi Yajima, Saki Shimizu, and Momoko Tsugunaga. They released their debut single, "Iku ZYX! Fly High" on August 6, 2003, followed by "Shiroi Tokyo" on December 10, 2003.