Yui Mizuno (水野 由結, Mizuno Yui, born June 20, 1999) is a Japanese musician, singer, model and actress. She is a member of the kawaii metal group Babymetal and a former member of the girl group Sakura Gakuin.
On August 2, 2010, at the age of 11, Yui, at the same time with Moa Kikuchi, joined Sakura Gakuin, an idol group managed by the talent agency Amuse, Inc.. The group had not yet released its debut single. During the audition, Yui and Moa performed a duo dance cover of "Over The Future" by Karen Girl's, which two former members, Ayami Mutō and Suzuka Nakamoto, have also joined Sakura Gakuin.
Besides performing as a whole group, Sakura Gakuin members were also divided into smaller subgroups, so-called clubs. Each club had its own musical group that recorded its own songs. Yui and Moa first became members of the "Baton Club" and its musical group Twinklestars and later together with Suzuka Nakamoto (as leader and lead singer) formed a heavy music club and its heavy metal-themed group Babymetal. Before the heavy music club was created by the management, none of the three heavy music club members knew what heavy metal was.