On the rocks

Background
"on the rocks" is an original song by OSTER project. The song utilizes MEIKO and KAITO's unreleased VOCALOID2 voicebanks. It was initially featured in the game Hatsune Miku and Future Stars Project mirai, and was not uploaded online until July 2014, more than two years later, where it received a new animated PV. This song has entered the Hall of Fame on June 12, 2015.

Concerts
A version of this song featuring MEIKO and KAITO's V3 vocals in place of their unreleased V2 vocals was featured in the Magical Mirai 2018 concert.