context: Supercell is a Japanese music group consisting of 11 members led by composer and lyricist Ryo formed in 2007 as a dōjin music group. Supercell debuted by utilizing the famous vocaloid Miku Hatsune singing as her vocals and sharing her videos on the Nico Nico Douga website. The popularity of the song led the group to release a self-titled album, Supercell on Comiket 74 in August 2008. Supercell entered the Sony Music Entertainment Japan label by releasing the Supersell album in March 2009, which circulated CD and DVD versions. Supercell released their first single, "Kimi no Shiranai Monogatari", in August 2009 with vocals by Nagi Yanagi. [1] "Kimi no Shiranai Monogatari" was the first single supersell that didn't use Hatsune Miku for vocals and the song was used for the Bakemonogatari anime soundtrack in 2009. Supercell released three more singles in 2010, one with fellow musician Kōz Kz from the anime. Livetune. Supercell released their second album Today Is A Beautiful Day in March 2011.
question: was Supercell's first song?
answers.text: Kimi no Shiranai Monogatari