Sphere (Japanese band)

Sphere (スフィア, Sufia) is a Japanese voice actress unit formed in 2009. The group consists of voice actresses Minako Kotobuki, Ayahi Takagaki, Haruka Tomatsu, and Aki Toyosaki, all of whom are signed to the music label Lantis under Bandai Namco Arts (formerly known as Bandai Visual). Sphere is known for performing theme songs for various anime series, in which the members also often star.

The group debuted with their single "Future Stream" in April 2009, followed by subsequent singles and albums released throughout their career. Their music style is primarily J-pop, often incorporating elements of electronic and dance music.

Sphere halted their group activities in 2017, but officially resumed them in 2019 with new music releases and live performances. They continue to be active as a group, although individual members also maintain active solo careers as voice actresses and singers. Sphere is considered a significant voice actress unit in the Japanese entertainment industry, known for their synchronized performances and vocal harmonies.