Zatsune Miku uses soy milk because she is allergic to real milk... so that's why she's Dark Miku... she can't enjoy anything in life!
This set-up cost only £10, equal to $16.50.
Kaito & Miku
Goldpaw cosplaying Black Rock Shooter
Rin Kagamine - Vocaloid
Kasane Teto - UTAU
Kaito - Vocaloid
Genius!