[1][2] Her best-known role is in The Idolmaster video game franchise where she voices Hibiki Ganaha from the rival group known as Project Fairy.

Other major roles include Pieck Finger in Attack on Titan, Kohaku in Dr. Stone, Mary in No Guns Life, Riko in Love Lab, Takao in Arpeggio of Blue Steel, Machi Tokiwa in Hanayamata and Saya Endō in Dagashi Kashi.

[3] Numakura made her voice acting debut in 2008 after auditioning for a role in the franchise The Idolmaster; she was cast as the character Hibiki Ganaha.

[8] Numakura, together with Mai Fuchigami and Hibiku Yamamura, formed the singing unit Trident, which performed songs for Arpeggio of Blue Steel.

[3] Her first single "Sakebe" (叫べ, Shout) was released on November 2, 2016;[17] the title song is used as the opening theme to the anime television series Magical Girl Raising Project.

[25] On November 25, 2019, Numakura announced that she would be ending her solo singing career after the release of a compilation album titled Minna de!