Mayu vocaloid 3

Mayu is intended to be a Yandere influence vocaloid, while her outfit is based on lolita fashion

Mayu has a standard usage "terms of use". Individuals and doujin circles can, without prior approval from EXIT TUNES, freely use the name MAYU, illustrations based on the character design as well as her voice created through the software as long as distribution is limited in scope or is one of the “noted distribution methods”, regardless of whether money changes hands in doing so or not. Furthermore, commercial entities can freely use the voice without prior approval from EXIT TUNES. However, the official logo and illustration is not included in this license.

and this the song from mayu