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.
Miku Sawai
She released her first album "Sentimental" on June 5, 2013. She then released the single , whose title track was used as the first ending theme to the 2013 anime television series "Kill la Kill"; the single peaked at 37 on the Oricon weekly charts. She released the single on August 13, 2014, whose title track is used as the first ending theme to the anime television series "Akame ga Kill!". She released the single on January 28, 2015; the title track is used as the ending theme to the anime television series "".