クリプトン・フューチャー・メディア
Rin &amp; Len were developed by Crypton Future Media using Yamaha's Vocaloid 2. Their voices were created by taking vocal samples from voice actress Asami Shimoda at a controlled pitch and tone. They were the second release within the "Character Vocal Series," which included the vocals Hatsune Miku and Megurine Luka. Rin was the first of the Kagamines to be illustrated and Len was made to match her, following Crypton's concept.