 Despite her success, however, Imaizumi took an temporary leave from the group between April and August 2017 and another in December 2017 from poor health.After the release of "Ambivalent", Imaizumi officially departed from the group on November 5, 2018 during a farewell ceremony in Kyoto, expressing her desire to pursue other forms of entertainment.She became the third member to leave the group, and the first member to leave since their musical debut.