She is best known as Sailor Mercury in the Pretty Guardian Sailor Moon musicals and the voice of the protagonist Karen Aijo in the Revue Starlight franchise.
24-year-old anime voice actress Momoko Koyama announced on her official blog today on April 23 that she will take a hiatus from singing activities by the end of May for having a vocal cord nodule surgery soon.
When I rest, it gets a little smaller and better, but it gets worse when the schedule becomes tight.”