【下田麻美】 悪ノ召使 【Shimoda Asami】 Aku no meshitsukai

Please take the time to read the description.

Shimoda Asami singing Kagamine Len's Servant of evil / Aku no meshitsukai (velvet mix).
Shimoda is Rin and Len's voice provider.

Original song:
   • Видео  

Music and lyrics by mothy

Aku no musume    • 【下田麻美】 悪ノ娘  【Shimoda Asami】 Aku no mu...  
Regret message    • 【下田麻美】 リグレットメッセージ 【Shimoda Asami】Regr...  

http://x-quest.jp/akuno/
悪ノ召使 Vocal: 鏡音レン feat. 下田麻美
from the CD:
悪ノ娘～凄艶のジェミニ～ ボーカル＆サウンドトラック (on sale, ￥2,000)

A play based on Rin and Len's Aku no series took place from 2010.01.27 to 2010.01.31 at the Tokyo Metropolitan Art Space. The original soundtrack (the CD is mentioned above) was composed by the author of the series, mothy (AkunoP).

Tokyo Metropolitan Art Space
http://www.geigeki.jp/index.html (english available)

I won't give any download link.