KAITO is looking cool as a jazz pianist, and MEIKO lights up the stage with her sexy sequined dress. 
— Website description[1]
On The Rocks is an Outfit for MEIKO.
Description[]
The Outfit's attire consists simply of a long red sequined dress, matching long gloves, and Mary-Jane shoes.
Game appearances[]
The Outfit first appears in Hatsune Miku and Future Stars: Project Mirai where it can be unlocked after watching the PV for "On The Rocks" and can be bought for 5000 Mirai Points. It returns in Hatsune Miku: Project Mirai 2 and Project Mirai DX where it can be unlocked by clearing the aforementioned song on any difficulty and can be bought for 5000 Mirai Points in Project Mirai 2 and 3000 Mirai Points in Project Mirai DX.