右肩の蝶 (Migikata no Chou)

Rin version =

Len version = {{Song box 2 |color    = white; color: #8A0886 |image    = Migikata Len.png |title    = "右肩の蝶" |date     = May 3, 2009 |views    = {{v|nn|2,600,000}} and {{v|pp|85,000}} |singers  = Kagamine Len |producers = Nori-P (music) |links    = {{l|nn|sm6928368}} {{l|pp|LOqi}} }}
 * Romaji: Migikata no Chou
 * English: Butterfly on Your Right Shoulder / Butterfly of the Right Shoulder
 * Kagamine Rin (chorus)
 * Yura Mizuno (lyrics)
 * Akiakane (illust)
 * {{l|yt|9gRWXcyAfBI}|reprint}} reprint, English subs

Background
This song is Nori-P's most notable work. Originally sung by Rin, Len's version was released a month later and was also well received upon its release, becoming arguably more popular than Rin's version. It's considered one of Len's most notable songs.

"Migikata no Chou" talks about a relationship that is in some way torturous, to the extent that it is as regretful as it is pleasant for the singer. The lyrics are clear, but are left vague enough to be interpreted in numerous ways. One interpretation is that the song is about someone who went out, hooked up, and was left feeling empty afterwards. Another interpretation is that the song is about Rin's love for Len and vice versa.

Though the song may have the same lyrics in both versions, the way the song starts, goes and ends are different. Rin's version has her singing clearly at the beginning, and ends with her chanting. In Len's version, Rin sings in the background, then Len then screams and the song starts; he adds an additional line; and he sings at a different pace throughout the course of the song, ending without Rin's chanting.

Discography
Len's version is featured on the albums Butterfly, EXIT TUNES PRESENTS Vocalogenesis feat. 初音ミク, Hatsune Miku -Project DIVA- extend Complete Collection, EXIT TUNES PRESENTS Vocalogemini feat. 鏡音リン・レン, The Legend of Chouzetsu Chouseishi, VOCALO DANCE, ''ボカロ超ミックス feat. 初音ミク, and Hatsune Miku ‐ Project DIVA‐2nd NONSTOP MIX COLLECTION''.

Rin's version is featured on the albums Butterfly, ''Digital Trax presents VOCALO★POPS BEST feat. Hatsune Miku, EXIT TUNES PRESENTS Vocalotwinkle feat. 鏡音リン、鏡音レン, EXIT TUNES PRESENTS Vocaloanthems feat. 初音ミク, MIKUNOPOLIS in LOS ANGELES, and VOCALOID BEST from ニコニコ動画(あか)''.

Covers and remixes have been included in additional albums.

Lyrics
Rin Version = Len Version =

Sheet music
Sheet music for this song was published in Vocaloid Super Selection.

Concerts
Len's version of this song was featured in the following concerts.