悪ノ召使 (Aku no Meshitsukai)

Background
This song was uploaded on April 28, 2008, and has reached over 3,000,000 views. It is arguably Len's most notable song, contending with "Migikata no Chou".

This song takes during the events of Aku no Musume, except from her (Riliane's) servant Allen's point of view. It details the story of how the twins were separated when they were very small and how the only thing of Riliane he could ever see was her soft, kind side, how she ordered him to kill Michaela (Miku) (who he fell in love with) and eventually traded places with Riliane when she is to be executed. The keywords of this song are 「僕が君を守るから　君はそこで笑っていて」(“I will protect you, so just be somewhere, smiling”). The official English title of the song is "His significance of existence".

This song is featured in the EXIT TUNES compilations Vocalogemini (Append Version) and Vocalolegend. It is also featured on Akuno-P's albums Evils Theater and Aku no Oukoku 〜Evils Kingdom〜 and the compilation albums KARENT presents Fairy tale & Girl's talk feat. 初音ミク, The VOCALOID, VOCALOID BEST from ニコニコ動画(あお), and 月刊eta Vol.08. It is the second track in the Story of Evil series.

Concerts
This song was featured in the following concerts.


 * MikuExpo Live in Tokyo 2011
 * MikuExpo Live in Sapporo 2011
 * MikuExpo Live in Tokyo 2012

Sheet Music
Sheet music was published in the book VOCALO ・Super ・Hits.