[2] She is best known for voicing Nana Daiba in Revue Starlight, Shioriko Mifune in Love Live!
Nijigasaki High School Idol Club, and Yuka Jennifer Sasago in D4DJ.
Koizumi was born into a musical family, with both of her parents and grandfather having music-related jobs.
She says that she relates to her Revue Starlight character Nana in that she is always preoccupied with her cast-mates' well-being.
[citation needed] Along with costar Haruki Iwata, Koizumi is part of the musical unit "harmoe".