It was currently freetime in Project Diva X (the killing game DLC for Diva X) and you see a blonde haired VOCALOID named Kagamine Rin(CV02) arguing with Kagamine Len, her twin brother who is also CV02

Rin: Hello there, name’s Kagamine Rin, I’m the ultimate CV02 VOCALOID along with my twin brother Len here

Len: …Hello I’m Kagamine Len, her brother and the ultimate maid