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"Kagamine" redirects here. For other uses, see Kagamine (disambiguation).

Kagamine Rin & Len VOCALOID2 act2 Append VOCALOID4 English | Piapro Studio | Songs Albums Notable Originals

Kagamine Rin & Len (鏡音リン・レン), codenamed CV02, are Japanese VOCALOIDs developed and distributed by Crypton Future Media, Inc., and were initially released in December 2007 for the VOCALOID2 engine. They are the second set of vocals for Crypton's Character Vocal Series and are both Character Voice VOCALOIDs. There have since been numerous installments such as additional voice banks dubbed 'Append', an update to the VOCALOID4 engine, and an English vocal.

Their voices are provided by the Japanese voice actress, stage actress, and singer Asami Shimoda (下田麻美 Shimoda Asami).

As of August 31, 2019, there will be no further installments with the VOCALOID program. Instead Crypton is focusing on their own program, Piapro Studio.[1][2]


The development of the Kagamines began when Crypton formulated the concept of making a pair of female and male voicebanks. The first idea was for two voices of a girl and an identical male of the opposite gender, just like twins.[3]

Crypton originally had the intention of distributing them as twins, but this was not adopted. Crypton stated that they approved of the many different interpretations of Rin and Len's relationship that they saw in different works. Crypton's final announcement was that the Kagamines were neither siblings nor lovers.[4][5] During their Append's production, Wataru Sasaki (aka. Wat) described them as two bodies with one soul.[6] Wat also said that the Append boxart makes the pair seem like twins,[7] due to the foetal position they were in.[8]


When the Kagamines were being recorded in 2007, their names were not yet decided. Their given names of Rin and Len were said to be based on "right" and "left" according to Asami Shimoda. She later confirmed in an interview after the Append release that the names were based on Ken and Rin from Hokuto no Ken, derived from a discussion about names that were familiar from her childhood.

Their surname was derived from the developing code combining Kagami (鏡, mirror) and Ne (音, sound). This refers to an "echo", which is a sound being bounced back to the user from a different direction caused by soundwaves hitting a surface at a direction that reflects it back the way it came.[9]

Their codename "CV02" means "Character Voice 02".


KEI was given a concept by Crypton that included Rin and Len's approximate ages as well as the idea of them being 'mirror images' and, like Hatsune Miku, androids. KEI was not given any further direction as he had already drawn the art for Miku, the first release in the Character Vocal Series.

Continuing the tradition of the Item War Internet Meme, many items were proposed for the pair. In the end, Len's item was a banana because his hair was commented to resemble a bunch of them, while Rin's item was an orange since her bow gave the impression of orange leaves. Before her release, Rin had the road roller assigned to her by accident in a video that suddenly received many views on December 1, 2007. Len had yet to be revealed at the time of the road roller meme.[10]

Rin was the first of the Kagamines to be illustrated and, following Crypton's concept, Len was made to match her. Their leg features were designed to mimic speakers.[11][12] The keytar Len is often featured holding in merchandise is a YAMAHA KX5. Their main design, of which is most noticeable on their boots, uses the YAMAHA EOS as a design base.

Also, each Kagamine has a particular musical clef symbol associated to their design. Rin has a G-clef (Treble-clef) on her shirt and Len has a F-clef (Bass-clef) on his. In their Append redesigns, they are found on chokers rather than their shirts.

When Rin and Len received a new set of vocals during their Act2 release, KEI took the opportunity to fix flaws in the original artwork.


  • Rin has "Act2" under her "02" arm tattoo. While Len now has "Act 2" on his headphones.
  • The top was changed around the armpit area, frills were added to the bottom of her top in Act2.
  • The shoulder position was corrected from the original design.
  • All of the yellow bands on her outfit were made thicker.
  • The fringe was made thicker above the left eye. And Len's fringe was reshaped and other strands were adjusted.
  • Len's face, particularly around the cheekbones, were reshaped.
  • The leg position was corrected; the original's left knee was wider and the right leg was too short. KEI corrected the "Act2" version by changing the positions of the foot. While Len's left knee had a minor tweak.
  • Forearms were shortened.
  • The interface design on the detached sleeves were changed from green bar to a blue bar.


For their appends, Wat wanted them to have a sense of transparency with their design.[13] In clarification to what he meant by this, he stated the "transparency" was in reference to their hearts.[14] Their append design and the official illustration were made by オサム (osamu).

For the V4x and V4 English designs, Rin was given a more silver/whiter look to make her appearance more refreshing.[15] The design was also based more on the EOS B700 rather than the Kx5 because of its more whiter appearance.[16] In addition, more synthesizer-based music symbols were used.[17]


For more on VOCALOID relationships, see the FAQ.



The Kagamines were marketed as "2 vocals for the price of 1" and were aimed to catch the interest of the growing VOCALOID fandom. Unlike Hatsune Miku, they were not an immediate hit, failing to meet marketing expectations despite receiving the same level of promotion Miku received at the time of their release. After the release of their "Act2" voicebanks, sales picked up steadily and the Kagamines eventually became one of the more heavily marketed VOCALOIDs though have never met the marketing strength Miku gained before them.

Crypton Future Media registered both "Kagamine Rin" and "Kagamine Len" as a trademark on January 29, 2015.[18][19]

On July 30, 2021 at the "Hatsune Miku Chronicle" (初音ミク・クロニクル) art exhibition event, merchandise featuring Kagamine Rin & Len's original concept artwork now known as Kagamine Rin & Len if. (鏡音リン・レン if) were revealed with a finalized illustration of the original design by KEI.[20][21]


The following covers the VOCALOID software, for future releases see Piapro Studio releases.

Kagamine Rin - Power
Kagamine Rin was designed to be a deeper tone teenage vocal compared to Hatsune Miku. She was meant to have tension to her vocal and was a "power" type vocal. The Kagamine Rin vocal, now known as "Power", has undergone dramatic overhauls over time due to quality issues and consequential versions have sounded different to past versions. The voice is voice acted and is an amateur singer.
Kagamine Rin - Warm
Designed to fit a more acoustic sounding song, this is a version of the voice with more warmth, focusing on the lower tones of the vocal range resulting in duller highs but more depth in lows.
  • Kagamine Rin & Len Append (VOCALOID2), December 27, 2010
  • Kagamine Rin & Len V4X (VOCALOID4, Piapro Studio2), December 24, 2015
Kagamine Rin - Sweet
A more cute sounding version of the voice of Rin with a sweeter tone.
  • Kagamine Rin & Len Append (VOCALOID2), December 27, 2010
  • Kagamine Rin & Len V4X (VOCALOID4, Piapro Studio2), December 24, 2015
Kagamine Rin - English
The English version of the Kagamine Rin vocal.
Kagamine Len - Power
Similar to Kagamine Rin "Power", the vocal is a "power" type vocal and is meant to have tension in the vocal. The vocal is meant to sound boyish, like a young masculine vocal. The vocal has undergone dramatic overhauls over time due to quality issues and some consequential versions are quite different to others, even compared to the Kagamine Rin "Power" vocal. The voice is of a voice acted result and represents an amateur singer.
  • Kagamine Rin & Len (VOCALOID2), December 27, 2007
  • Kagamine Rin & Len act2 (VOCALOID2), July 18, 2008
  • Kagamine Rin & Len Append (VOCALOID2), December 27, 2010
  • Kagamine Rin & Len V4X (VOCALOID4, Piapro Studio2), December 24, 2015
Kagamine Len - Cold
The Kagamine Len "Cold" vocal is the opposite of the Kagamine Rin "Warm" vocal and is designed to sound moodier, with more focus on the highs. The result is fuller high sounds but the lower sounds are less attractive.
  • Kagamine Rin & Len Append (VOCALOID2), December 27, 2010
  • Kagamine Rin & Len V4X (VOCALOID4, Piapro Studio2), December 24, 2015
Kagamine Len - Serious
Serious is a vocal that is designed to be the opposite of Kagamine Rin's "Sweet" voicebank. It is quite emotional sounding compared to "Cold".
  • Kagamine Rin & Len Append (VOCALOID2), December 27, 2010
  • Kagamine Rin & Len V4X (VOCALOID4, Piapro Studio2), December 24, 2015
Kagamine Len - English
The English version of the Kagamine Len vocal.
  • Kagamine Rin & Len V4 English (VOCALOID4, Piapro Studio2), December 24, 2015

Music featuring Kagamine Rin & Len

Rin alone logo
Len alone logo
YouTube logo
Kagamine Rin
Categories Original song
Drifting Away
YouTube logo
Kagamine Rin
GuitarHeroPianoZero (song), tsunya99 (Illust.)
Categories Original song
minus in the sun
YouTube logo
Translation minus in the sun
Kagamine Len
Categories Original song
YouTube logo
Kagamine Len
Circus-P (music, lyrics), Sleppu (illust, video)
Categories Original song
Search for music featuring Kagamine Rin & Len [show/hide]



Google Trends



Initially, it was reported that their package sold 20,000 units. This was half the amount that the Hatsune Miku product before them sold.[22]

During the VOCALOID2 era, the Kagamine package competed with the Megurine Luka package for 2nd place in the top 10 products. Usually, the Kagamine package managed to get the 2nd place spot, pushing Luka to 3rd place.

Their Append outsold the Miku Append package during the period after their release. The Act2 package and Append secured 4th and 5th spot between them in Crypton's end of year top 10 VOCALOID sales despite only being available for a short period of time (mostly owed, but not entirely, to pre-orders).[23][24][25] However, in June 2011, their Append had fallen to 8th place, one place below KAITO's VOCALOID voicebank.

During 2013, when both KAITO V3 and Hatsune Miku V3 were released, the charts were disrupted. When the charts resumed some form of order, the Kagamines were left in the 5th or 6th spot, leaving them overall more popular than Luka by MEIKO V3's release in 2014. Their Append had not been sighted for months and was by now completely off the charts. After MEIKO's V3 release, they disappeared from the charts, leaving them as the only Character Vocal Series member with no products in the charts. By mid-2014, they, along with the VOCALOID2 Megurine Luka package, would only make temporary appearances in the charts, but no longer held any form of constant ranking.

In 2014, Crypton's download store, Sonicwire, reported that the Kagamine Append package was the 8th most sold VOCALOID package on the store, while their Act2 product claimed 5th place.[26] In 2015, the Kagamine V4x package claimed 5th position, while the English bundle version claimed 4th. The sales were based on acquired sales through pre-orders and sales for just 6 days.[27] In January 2016, the bundled version of the update held the 1st place spot on Crypton's ranking, followed by the Japanese package in second.


The Kagamines were slow to gain popularity in the Japanese fandom after the backlash from their original voicebanks. In later years, although they gained the second-highest number of songs, they were not as popular as Hatsune Miku.

In the Japanese fandom, Rin is the more popular of the two, with more related works than Len.

By the time of their V4x release, the duo had over 100 hit songs between them.[28]

Overall, Kagamine Rin is the 2nd most popular Crypton VOCALOID, while Len is the 4th. The majority of Japanese producers purchasing their package use Rin, with her having up to half of Len's popularity on top of her own popularity levels. Len can often at times lose his 4th position place to KAITO, if Rin's contributing popularity is not factored in. Rin herself will also at times lose popularity to Megurine Luka, though due to Rin's popularity being boosted by Len, Luka does not always maintain it.


Because of KAITO's failure, male voicebanks had little demand at the time of the Kagamines' release. Len's voicebank was the only male VOCALOID2 vocal until Camui Gackpo's release.[29]

Their designs spawned many producer-based derivatives.


An independent search revealed that most VOCALOIDs had less than 1,000 videos uploaded onto Nico Nico between July 1 and December 15, 2015. The Kagamines, however, managed to gain enough views to not fall into this category. Rin received 2,811 uploads while Len received 2,021. Rin had the 3rd highest total views during this period of any VOCALOID with 5,327,456 views and 477,046 mylists, and Len managed 4,555,580 views and 413,901 mylists. When sorted by average, Len was third with 2254.12 views per video and 204.8 mylists (which was more than Miku’s), and Rin had 1895.22 views per video and 169.71 mylists. However, when the views were based on the more accurate mean total, Len and Rin achieved 355 views/16 mylists and 349 views/16 mylists respectively per video, ranking last among the top 6 VOCALOIDs. However, the Kagamine software was the only VOCALOID package to be in all top 6 lists besides GUMI.[30]

In February 2014, Vocaloid Otaku user "Dessert>desert" decided to run a test to see how many illegal VOCALOID downloads were made via torrent. The Kagamine package was ranked the 3rd most popular illegal of the singular package downloads with 4,777 downloads. They were beaten by MAYU at 11,404 and VY2v3 at 12,434 downloads.[31]

In 2015, a survey showed that Kagamine Rin was the 3rd most popular VOCALOID in 2014 on Nico Video while Kagamine Len was the 6th most popular.[32]

  • It took 25 hours (4 hours a day) to record all the Kagamine Appends.[33]
  • Some call Rin and Len by the incorrect names "Lin" and/or "Ren". Though the romanized version of the words could be either, the English version was confirmed as "Rin and Len". Since there is no dubbed version to contend with, the names remain the only official names in existence for the vocals. This is also backed up by the origins of their names as "R" (Rin)" and "L" (Len).
    • Note; "L" and "R" mean "Left and Right". They are the letters you find on a set of headphones (and sometimes other equipment such as speakers). Usually, there is not enough space to write "left" and "right" on headphones. "L" refers to left ear and "R" is right ear.
  • A total of 10 voicebanks makes the Kagamine package the most expansive set of vocals within the VOCALOID2 era. They are currently 3rd in the total number of vocals released behind Miku (with 15 vocals) in second and GUMI (with 17) in first.
  • First dual voicebanks released with two "VOCALOIDs" in one package
  • Only dual voicebanks released for VOCALOID2
  • First male (Len) released for VOCALOID2
  • First VOCALOIDs to be updated
  • First vocal (Len) released not to be the same gender as the provider
  • First male (Len) to be Appended


  1. https://blog.crypton.co.jp/l/2019/08/n1908311/
  2. https://twitter.com/labopton/status/1167698329389551616?s=19
  3. CloseUp NetTube - 鏡音リン・レン特集1・発売元インタビュー (Interview with Crypton "How Rin and Len Kagamine were created")
  4. Nikkei Electronics (973) Mar.10,2008,126-127, ISSN 0385-1680
  5. "VOCALOID wo Tanoshimou Vol.2" published by Yamaha Music Media,2009, Page 47, ISBN 978-4-636-84438-2
  6. https://twitter.com/vocaloid_cv_cfm/status/9015396422131712
  7. https://twitter.com/vocaloid_cv_cfm/status/7121733874098176
  8. https://twitter.com/vocaloid_cv_cfm/status/7124695778332672
  9. https://blog.sonicwire.com/2009/01/post-95.html [dead link]
  10. http://z8.invisionfree.com/VocaloidOtaku/index.php?s=5ce362ea62a7a7f0574ad8d58b59cdc7&showtopic=1670&st=20&#entry899761[dead link]
  11. P-Tina - Interview(s) with Crypton and KEI
  12. VocaloidOtaku - Our Favorite VOCALOIDS: Interview with KEI
  13. https://twitter.com/vocaloid_cv_cfm/status/6224562366713856
  14. https://twitter.com/vocaloid_cv_cfm/status/6225615095078912
  15. https://twitter.com/vocaloid_cv_cfm/status/666221924683411456
  16. https://twitter.com/vocaloid_cv_cfm/status/664415899621810176
  17. https://twitter.com/vocaloid_cv_cfm/status/664414723186671616
  18. http://www.trademarkia.com/kagamine-rin-79159405.html
  19. http://www.trademarkia.com/kagamine-len-79159407.html
  20. https://piapro.net/39chronicle/ex.html
  21. https://www.hmv.co.jp/artist_%E5%88%9D%E9%9F%B3%E3%83%9F%E3%82%AF%E3%83%BB%E3%82%AF%E3%83%AD%E3%83%8B%E3%82%AF%E3%83%AB_000000000875231/
  22. http://www.itmedia.co.jp/news/articles/0807/23/news046.html
  23. https://blog.sonicwire.com/2010/12/2010-vocaloid-1.html
  24. Vocaloid Blog - クリプトン社発売のソフト音源についての2011年1月のトップセラー! (Top of the January 2011 release of the software's sound on Crypton!)
  25. Vocaloid Blog - クリプトン社発売のソフト音源についての2010年12月のトップセラー! (Top of the December 2010 release of the software's source for Crypton?)
  26. http://blog.sonicwire.com/2014/12/sonicwire-2014-5.html
  27. http://blog.sonicwire.com/2015/12/sonicwire-2015-4.html
  28. http://www.dtmm.co.jp/item/2326
  29. INTERNET Watch - クリプトン・フューチャー・メディア社長 伊藤博之氏(前編) (Crypton Future Media president Hiroyuki Itō (part one))
  30. http://www.vocaloidism.com/2012/01/04/the-harsh-realities-of-vocaloid-on-nico/
  31. http://www.vocaloidotaku.net/index.php?/topic/48822-data-on-pirated-vocaloids/page__p__1121754__hl__data__fromsearch__1&#entry1121754[dead link]
  32. http://ch.nicovideo.jp/kadotanimitsuru/blomaga/ar699704
  33. Weekly Plus - VOCALOID『鏡音リン・レンAppend』発売記念インタビュー第2弾は声優の下田麻美さん♪ (Len Append, interview with Shimoda Asami)

External links

Language Description Site
Japanese crypton Future Media Inc. official homepage Link
Japanese Kagamine Rin/Len ACT2 product page for CV02 Link
Japanese Kagamine Append product page for CV02a Link
Japanese Toraboruta-P’s Blog Entry 1 Link
Japanese Toraboruta-P’s Blog Entry 2 Link
Japanese Toraboruta-P’s Blog Entry 3 Link
Japanese Danchan-P’s Blog 鏡音リン・レン ACT2について、今さら。 Link
Japanese VTTC VOCALOID Training Techniques Collecting: Comparing Act 1 and Act 2 Link