Hatsune Miku
Hatsune Miku was the first Vocaloid developed by Crypton Future Media after they handled the release of the Yamaha vocal Meiko and Kaito. The name of "Hatsune Miku" was conceived soon after the Vocaloid 2 announcements, when an English and Japanese vocal were developed for the character. The intended design was delayed and later used for Megurine Luka instead. Miku was intended to be the first of a series of Vocaloids called the ""Character Vocal Series"", which included Kagamine Rin/Len and Megurine Luka. Each had a particular concept and vocal direction.
Kimi no Shiranai Monogatari
During the production of the 2009 anime series "Bakemonogatari", Supercell was asked to compose what would later become the ending theme song "Kimi no Shiranai Monogatari". It was already decided that Supercell would release their debut album "Supercell" in March 2009, which used the Vocaloid singing synthesizer Hatsune Miku as the vocalist. In place of Miku, Supercell employed the singer Nagi Yanagi, a vocalist who had previously submitted cover versions of songs to the Nico Nico Douga video sharing website under the name Gazelle. "Kimi no Shiranai Monogatari" was the first release by Supercell to not use Miku as the vocalist. Yanagi was chosen for "Kimi no Shiranai Monogatari" by Ryo, who had been a fan of her voice even before uploading his own songs to Nico Nico Douga in late 2007. Roughly the next day after Ryo uploaded Supercell's first song "Melt" onto Nico Nico Douga in December 2007, Yanagi uploaded a cover of her singing the song. Yanagi, who was herself a fan of Ryo's music, contacted him and the two talked about someday collaborating.