Numakura decided to become a voice actress while in high school after listening to a drama CD lent to her by a friend who liked anime; she also became a fan of the Gundam franchise during this time and she cited this as another reason for her deciding to become a voice actress.[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.[4] She made her anime voice acting debut in 2009, playing the role of a student in an episode of the anime series Gintama.[1] She would primarily voice background and supporting roles until 2011, when she played Hibiki in the anime adaptation of The Idolmaster.[1]
In 2012, Numakura was cast as the role of Arata Obata in the anime series Black Rock Shooter[5] and as the role of Yurika Tōdō in the franchise Aikatsu!.[6] In 2013 she played the role of Riko Kurahashi in the anime series Love Lab[7] and the role of Takao in the anime series Arpeggio of Blue Steel.[8] Numakura, together with Mai Fuchigami and Hibiku Yamamura, formed the singing unit Trident, which performed songs for Arpeggio of Blue Steel.[9] In 2014 she played Nanami Tokou in the anime series Brynhildr in the Darkness[10] and Aoi Sakurai in the anime series Rail Wars![11] and Machi Tokiwa in the anime series Hanayamata.[12] In 2015, she was cast as the character Paula McCoy in the anime series Nisekoi.[13] In 2016, she was cast as the character Saya Endō in the anime series Dagashi Kashi[14] and as Kano Sazanami in the anime series Magical Girl Raising Project.[1] Trident disbanded in 2016 following the release of its last album Blue and a final concert at the Makuhari Messe Hall.[15] In 2017, she was cast as Akane Hiyama in the anime series Love Tyrant.[16]
Numakura made her debut as a solo music artist under the Flying Dog label in 2016.[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.[18] Her second single "Climber's High!" was released on February 8, 2017;[19] the title song is used as the opening theme to the anime series Fuuka, where Numakura plays the role of Tama.[20] Numakura opened her official fanclub Area Nu in April 2017,[21] and she released her first album My Live on June 14, 2017.[22] She made an appearance at Animelo Summer Live in 2016[23] and she made an appearance at Animax Musix 2018.[24] She released her second album Ai (アイ) on February 20, 2019.[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! (みんなで!) on February 12, 2020 and her final concert at Toyosu Pit on February 16, 2020, although she will continue her activities as a voice actress. Her fanclub is set to close in March of the same year.[26][27]
Personal life
Numakura announced her marriage to fellow voice actor Ryōta Ōsaka on October 23, 2019.[28] She announced that she gave birth to a baby boy on December 19, 2021.[29]
