[10][11] In April 2017, Imaizumi took an temporary leave from the group due to poor health and returned in August the same year.

[12][13] 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 was featured in a variety show produced by TV Asahi titled Imaizumi Yui no Otonajoshi (今泉佑唯のオトナ女子, lit.

), starred in the 2020 movie A Life Turned Upside Down: My Dad's an Alcoholic (酔うと化け物になる父がつらい, Yōtobakemono ni Naruchichi ga Tsurai), and performed in a stage adaptation of Azumi.

[24] In November 2021, Imaizumi portrayed the title character in the stage adaptation of the manga Lady Snowblood[25] and performed the theme song, which was released digitally.

[28] On October 26, Imaizumi announced her retirement from the entertainment industry, citing concerns about the media's intrusion to the private lives of her family and child.

[33] However, due to Watanabe's arrest, Imaizumi announced that she would not be registering her marriage to him and would raise her child with the help of her family.