She debuted in 1999 as the singer of the opening and ending themes to Key's visual novel Kanon.
Kanon (2002 TV series), Storyboard (Ep 7, 8, 11), Series Story Editor
Nanika is heavily influenced by Japanese anime, such as Kanon and Ghost in the Shell.
Following the convention established with Kanon and Air, Key has released three more arrange albums bundled with the first-print releases of Key's later titles Clannad, Little Busters!, and Little Busters! Ecstasy.