VY1 (stands for "Vocaloid Yamaha 1" , also it was codenamed "MIZKI" during its development  ) is the first of the VY series being developed by Yamaha and produced by Bplats,Inc. It was released in deluxe and standard editions on September 1, 2010.
The standard version of the software has just the Vocaloid software included. The Deluxe edition comes with a free CD featuring a number of tracks by different producers, along with the configuration they used for the song and their own interpretation of the Vocaloid. This also provides users examples of how the voicebank can be used and offers ideas and suggestions for their own songs. The producers used were already known users gathered from Nico Nico Douga and Youtube to help demonstrate the new standard Yamaha hoped to set with VY1.
Due to the professional design of VY1, the vocal often appears in use for aps and equipment that involves derivative products produced by Yamaha, either by its own or with VY2.
At VocaFes 2011, two winners were announced whose images will be used for VY1 and VY2. VY1's redefined version however was not presented alongside the original artwork like VY2's was because of an error. Previously, it was announced they would host a competition for everyone to design mascots for the characters as a method of percieving how the fandom thought of VY1 and VY2.
VY1 was first announced during the time when the focus was on Lily, and comparisons between the reaction in Japan towards Lily and VY1 have been noted and often brought up. Whereas Lily had many songs upon her release, VY1 was apparently slow to gain popularity at first. However over time, VY1's biggest hits in Nico Nico Douga mostly comes from 'new' producers who have never uploaded a work using 'Vocaloid' before.
A independent Vocaloid search on Nico Nico Douga revealed that most Vocaloids had less then 1,000 videos uploaded on Nico Nico Douga in between July 1 and December 15 2011 with VY1 falling into that category as well.
VY1 voiced VOCALO Revolution's introduction and credits, with CUL being the mascot character. However, many fans have confused VY1 as CUL being the same Vocaloid; because later on CUL was announced to be a Vocaloid3. VY1 and CUL (Vocaloid) have no relations whatsoever for VY1 only voices VOCALO Revolution's videos.