Toyosaki's first musical performance was with fellow voice actress
Eri Kitamura on the
image song CD on 23 April 2008. She then performed the opening and ending
themes of the 2009
anime series
K-On!, "Cagayake! Girls" and "Don't say 'lazy'", respectively, with voice actresses
Yōko Hikasa,
Satomi Satō, and
Minako Kotobuki. Both themes were released as singles on 22 April 2009. The "Cagayake! Girls" single sold about 62,000 copies during its debut week, ranking fourth on
Oricon's latest weekly singles chart, while the "Don't say 'lazy' " single sold about 67,000 copies during its debut week, placing second on the chart. The opening and ending singles remained on the chart during the week of 27 April to 3 May, falling to sixth and fifth, while selling an additional 19,963 and 22,094 copies. On 23 June 2009, "Don't say 'lazy'" was awarded Animation Kobe's "Best Song" award. Toyosaki then performed the opening theme of the 2009
First Love Limited series, titled "Future Stream" with Ayahi Takagaki, Haruka Tomatsu, and Minako Kotobuki. The theme was released as the group's first single on 22 April 2009. Toyosaki, Hikasa, Satō, and Kotobuki performed the insert song, a song that occurs within the episodes of the anime, "Fuwa Fuwa Time" for
K-On!. It was released as a single on 20 May 2009. Shortly after, Toyosaki, Kaoru Mizuhara, and
Rie Kugimiya performed "Heart Connected to You", the opening theme of
Kanamemo, which was released 5 August 2009. On 25 June 2009, she provided the narration of a television advertisement for the performance of "Blue Feather", a single by the musical group Binecks. The
First Love Limited Character File Vol. 3 image album, released 23 July 2009, includes a song featuring Toyosaki. In July, the anime series
Sora no Manimani debuted with the Sphere performed opening theme "Super Noisy Nova", which was released as a single on 29 July 2009. Toyosaki, Hikasa,
Satomi Satō, Kotobuki and
Ayana Taketatsu performed on
K-On!s mini-album released 22 July 2009. The mini-album sold over 67,000 copies to debut at the number one spot on
Oricon's latest weekly album chart. It is the first album credited to fictional anime characters to do so. On 27 October 2009, Toyosaki released her first solo single "love your life". Sphere released their third single "It Raises the Wind/Brave my heart" on 25 November 2009. The group released their first album
A.T.M.O.S.P.H.E.R.E on 23 December 2009. After, the group performed the opening theme of
Ichiban Ushiro no Daimaō, "REALOVE:REALIFE", which began airing in April 2010. The theme was released as a single 21 April 2010. Sphere next performed on the first day of
Animelo Summer Live 2010, at
Saitama Super Arena on 28 August 2010. At the 2010 Seiyu Awards, Toyosaki and her collaborators were awarded "Best Musical Performance" for their performance on
Hōkago Tea Time. In July 2010, the
Asobi ni Ikuyo: Bombshells from the Sky anime series began airing with "Now loading...SKY!!" by Sphere as its opening theme. The theme was later released as a single on 28 July 2010. In October, the
Otome Yōkai Zakuro anime premiered with Sphere's "MOON SIGNAL" as the opening theme. Toyosaki's voice is also featured in , one of the series' three ending themes. "MOON SIGNAL" was released as a single on 20 October 2010, and "Junjō Masquerade" was released with the other endings on 24 November 2010. Toyosaki was the fourth top-selling voice actress in 2011. ==Personal life==