[1][2] During their audition, Mizuno and Kikuchi performed a duo dance cover of "Over The Future" by Karen Girl's, two former members of which, Ayami Mutō and Suzuka Nakamoto, had also recently joined Sakura Gakuin.

[9] Following a leave from the show Legend "S" Baptism XX, Mizuno was absent from Babymetal's tour of the United States in May 2018, with no advance warning.

Amid fan speculation on Mizuno's status with the group, a representative of 5B Management, the American management company representing Babymetal, replied to an inquiry from Alternative Press Magazine: "Yuimetal remains a member of the band, but she is not on this current U.S.

On October 19, 2018, Babymetal officially announced that Yuimetal would not be joining the band for the next phase of their tour and would no longer be a member of the group due to poor health.

[11] Mizuno released a statement[12] shortly after about her decision to leave Babymetal, explaining that she may go on to pursue a solo career in the future.