Kagamine Rin & Len (Japanese: 鏡音リン・レン), officially code-named CV02,[1][2] are a pair of Vocaloid software developed by Crypton Future Media, headquartered in Sapporo, Japan. Their official moe anthropomorphism consists of a pair of twin vocals, a boy and a girl, respectively named Len and Rin.[3][4] They use Yamaha Corporation's Vocaloid 2 and Vocaloid 4 singing synthesizing technology. Their voices are samples of the voice actress Asami Shimoda. They have performed at live concerts together, as