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Kagamine Rin/Len

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Kagamine Rin & Len (鏡音リン ・レン) is the second product released on December 27, 2007, they are Vocaloid2 Character Vocal Series developed by Crypton Future Media Ltd. (CFM), male voice (Len) and female voice (Rin). Their surname was from the developing code combining Kagami (鏡, mirror) and Ne (音, sound).


Vocaloid 2

Crypton Future Media intended to project a Vocaloid with low-teen girl's voice at first following Miku Hatsune, but there was a demand for a boy's voice, so Crypton Future Media hired a voice actress who can produce both sounds. Kagamine Rin was the first voicebank developed and introduced to the Vocaloid consumer market on November 8th 2007.[1] However, the package included two voicebanks: one for Rin and another for Len, both provided by the seiyū Asami Shimoda (下田 麻美 Shimoda Asami), Kagamine Len was unveiled later after Kagamine Rin on December 3rd 2007.[2] The package was priced at the same price as Hatsune Miku, even though there was two voicebanks in the box.[3][4]

At the time of recording in 2007, their names had not yet been 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, the name itself was based on the names of Ken and Rin from Hokuto no Ken, the names were derived from a discussion about names that were familiar from her childhood. According to Asami Shimoda, Len's voice was achieved by singing within her chest, while Rin's at the top of her head. [5][6]


Act 2

On June 12, 2008, Crypton announced that the updated edition, named "Act2", would be released in early July 2008. Crypton Future Media apologized for the bad quality of the original Kagamine Rin/Len product. They explained that they had rushed the Kagamine product onto the market in suite of Hatsune Miku's success and promised to produce a better quality version to correct their mistake. The product itself had been in production between April and September 2007 and had not been changed between then and their release. The following April they continued to work on the vocals from where they were left off to tweak the issues surrounding them. Crypton Future Media also promised to speak more closely with the fans and keep them up to date more on their Vocaloid software progress in future.[8]

The new version was released to address issues with the original voicebanks that affected their ability to sing clearly. The Database was reshuffled around to allow the voicebank libraries to handle the samples better and Crypton Future Media worked heavily to improve the vocals. Act2 was as an independent installation, coexisting with the initial software.[9] During the Kagamine Act2 production, Crypton Future Media also took the time to change the End User agreement on their CV series to make it easier to understand.[10]

Users who had bought the old version got an expansion disc free of charge, this continued until 20th September 2008 after which users could no longer register to receive the Act2 software for free.[11][12] On June 18, 2008, beta demonstration songs using the new version were released on the company's official blog; and on July 18th, the act2 was released. The original version of the software is now retired from sale by Crypton Future Media themselves and it is now no longer possible to buy the software from them.[13][14][15]



As well as a new set of vocals for the pair KEI took the opportunity to fix art flaws in their artwork.

Kagamine Rin's introduction artwork

  • Rin has "Act2" on her arm under her "02" tattoo.
  • Rin's top was changed in the introductory image between versions around the armpit area. Frills were added to the bottom of her top in Act2
  • Her shoulder was not correctly drawn in the original version
  • All the yellow bands on her outfit were made bigger on Act2.
  • Her fringe was made thicker above the left eye.
  • In Kagamine Rin's artwork, her left knee was thicker and her right leg was too short. Kei corrected this in her Act2 version. Her right leg position changed and so did her Left foot position
  • Forearms have been shortened in Act2.
  • The cyber-on-normal clothing design on their detached sleeves were changed from a green bar to a blue one

Kagamine Len's introduction artwork

  • Kagamine Len has "Act 2" on his headphones.
  • The cyber-on-normal clothing design on the detached sleeves were changed from a green bar to a blue one
  • His fringe was reshaped, other strands were adjusted as well
  • Len's face, particularly around the cheekbones, have been reshaped.
  • His left knee has a minor tweak

Boxart changes;

  • Kagamine Rin's leg position was changed in their boxart so it was lifted up off the ground, the only way the previous position would have worked was if her leg was deformed or broken.
  • Kagamine Rin's knee is rounded instead of sharp
  • Both had the cyber-on details changed on their detached sleeves

Append - the Future of Rin/Len

After Miku Append began, Rin and Len (鏡音リン・レン・アペンド) were confirmed to have appends being worked on. Len Append was in the process of production first and demos of his voice were given out; (high voice demo), (low voice demo). The append was officially released on December 27, 2010. The total number of voicebanks for each one is 6. There are 3 voicebanks being assigned to each Kagamine and had been created from vocal performance of their voice providers.[16]. Sample demo songs have been given out on Crypton's official page and their official YouTube channel online. Rin's appends are "power", "warm", and "sweet". Len's appends are "power", "cold", and "serious".[17][18]

Their Append outsold the Miku Append during the period after their release.[19][20] However, they did not maintain this, in June 2011, their Append had fallen to 8th place, one below Kaito's Vocaloid voicebank.

Vocaloid 3

English version

Crypton Future Media is considering an English version of the software.


As they were under development, Crypton had the concept of making a pair of male and female voicebanks. The first idea of the concept was twin voices of a girl and her mirror image of opposite gender, just like twins. [21]

CFM had an intention to distribute them as twins, but this was not adopted either. After seeing many works that depict their relationships differently, Crypton announced on a magazine interview that those would meet their ideal. Crypton announced that they are neither siblings nor lovers. [22][23]

KEI was given the concept Crypton intended, their approximate ages, an image of mirror, and an image of androids, but was not given any other directions when he was asked to illustrate Rin and Len by Crypton, as Kei had already illustrated Miku before. Rin was the first one to be illustrated and Len was made to match her, following Crypton's concept. Their leg parts are designed to mimic speakers.[24][25]

Their Append design and the Official Illustration of those ones were made by オサム (osamu) .

Good Smile Racing

See Good Smile Racing


FiguFigma RinLen

Len and Rin figma figures

The Kagamines have had several figurines made for them. Some are based on one and not the other, other times they have had a model each but were released seperately and on some occasions together.

Kagamine Rin has more figurines than Kagamine Len. As well as having a standard Figma and Nendoroid figurine each, Rin has had a figurine based on the "Meltdown Hard R.K. mix" PV. She has also appeared alongside Miku and Luka in the Good smile racing figurine promotions. When the first Pullip Dolls were released, both Rin and Len were released alongside Miku, they were based on the same body model as each other.

The pair have seen a number of Garage Kit packs as well.

US Debut

The Kagamines appeared in the Los Angeles Mikunopolis concert in July 2, 2011, along with Hatsune Miku and Megurine Luka. Rin performed "Meltdown" in her Hard Rock remix outfit and Len performed 'Butterfly on Your Right Shoulder' (Ft. Rin).[26]

Guest Appearances

In Zoku Sayonara Zetsubou Sensei a pair of Len and Rin look a likes are seen in the waiting queue during the auditions of the role of Meru Meru, however they do not have the Kagamine's known colors.[27]

In the anime Maria†Holic Rin and Miku appear on a scene on episode 12, which can be seen on Youtube

In the manga Comic Party, during the fair there is a person wearing Rin's ribbon and has the same hairstyle as hers.

From episode 12-16 of Hyouka, there are Miku, Rin, Len, and Luka cosplayers.

Voicebank Libraries

Vocaloid 2

Kagamine Rin/Len (CV02)

Template:Infobox voicebank

The Kagamine were released as a more advanced Vocaloid package than Hatsune Miku and contained 2 voicebanks for a male and a female vocal. Since they were sold together as a pair at the same price as Hatsune Miku, the Kagamine package was considered a bargain for producers. Kagamine Rin's vocal is set as the default and users will have to switch to Kagamine Len's vocal manually. After the release of "Act2", the original vocals became referred to as "Act1" by both Crypton Future Media and Vocaloid fans.[28]

Kagamine Rin/Len - Act 2 (CV02)

Template:Infobox voicebank Act 2 was released to solve the Kagamine's pronunciation problems. [29][30] Act 2 is a separate installation, this version of the software later replaced the original and the original voicebanks were phased out of sale completely. Just as with the original, the default voicebank is Kagamine Rin and users will have to manually select Kagamine Len.

For users with both versions, they have a choice between four voicebanks overall: the newer voicebanks or the older voicebanks, both with slightly different results. Though an update of the original Kagamine package, this version is still outdated in terms of overall quality and later Vocaloid2 standards. Len remains the weaker of the two voicebanks in terms of ease of use.

Kagamine Rin/Len (CV02); Append

Template:Infobox voicebank The Append release also gave older Kagamine users the chance to update the Vocaloid2 engine to a newer version, as the Append had the latest engine version. Users also need the Kagamine Rin/Len Act2 voicebanks to be able to install and use the Append voicebanks - the Append will not work with the original voicebanks. Though there are differences in the 6 Append voicebanks in terms of performance and smoothness, the Appends themselves were overall much smoother and of a higher quality than the original voicebanks.

Unlike the previous Hatsune Miku Append (in regards to her Append; SOFT voicebank), this particular Append has no voicebanks that match the original optimum range and tempo. Thus, it is much harder to escape the need to edit VSQ files that originally fit the Kagamine Rin/Len Act2 vocals. If one complies with using the vocals offered with the Append with the correct Kagamine vocal, they will find that there is a lot less options to expand Rin or Len than what the Miku Append offered (just 3 vocals for each compared to Miku's 6). This makes the Kagamine Appends much harder to use overall, while fitting in with the Kagamine's intention of being a more advance product than the Hatsune Miku vocal was. However, due to the increased contrast in vocals compared to the Miku Append, this particular Append allows the Kagamines to expand out into very different genres, more so than the Miku append offered for Miku.

Vocaloid 3

V3 Kagamine Rin/Len (CV02)

Template:Infobox voicebank

Update of their Vocaloid2 vocal "Kagamine Rin/Len Act2".

V3 Kagamine Rin/Len (CV02); Append

Template:Infobox voicebank

Update of their Vocaloid2 vocal "Kagamine Rin/Len;Append".

V3 Kagamine Rin/Len (CV02); English

Template:Infobox voicebank

This is a new vocal that Crypton Future Media are planning. This vocal will allow much higher quality results in English than using their Japanese version for English results.

Examples of Usage

kagamination HEART

3.jpg Author(s): Anmerutsu-P
Category: Original Song
Featuring: All Kagamine voicebanks.
Nicovideo Broadcast  Youtube Broadcast    


default.jpg Author(s): Orebanana-P (Rin) Giga-P (Len)
Category: Cover Song
Featuring: Kagamine Rin Act1, Kagamine Len Append power
Nicovideo Broadcast  Youtube Broadcast    

Rin Rin Signal

default.jpg Author(s): Signal-P
Category: Original Song
Featuring: Kagamine Rin Act2, Kagamine Len Act2
Nicovideo Broadcast  Youtube Broadcast    

Notable Kagamine songs

Main article: Songs featuring Kagamines
Main article: Songs featuring Kagamines/Rin
Main article: Songs featuring Kagamines/Len
Main article: Youtube List/Kagamine Rin/Len Songs



The Kagamine's package in 2nd place, 12/10/2011, this is the usual place they hold in the top ten Crypton products list. Note; Meiko and the Kagamine append were missing from the list

They were slow to gain popularity in the Japanese fandom after the backlash of their original voicebanks, and although they have 2nd highest number of songs combined, they are not as popular as Hatsune Miku who came before them. Their designs have also spawned many producer based derivatives.

In the Japanese fandom, Rin is the more popular of the two Vocaloids with more related works than her counterpart Len. Part of the problem in the Japanese fandom was owed to the backlash of Kaito's failure, male voicebanks had so little demand at that time and Len's voicebank was left as the only male Vocaloid 2 vocal until Gakupo's release, and was not used as often as Rin's voicebank.[31]

A independant Vocaloid search on Nico Nico Douga revealed that most Vocaloids had less than 1,000 videos uploaded on Nico Nico Douga in between July 1 and December 15 2011. The Kagamines, however had managed to gain enough views not to fall into this problem. Rin had received 2811 uploads while Len had received 2021. Rin had the 3rd highest total views during this period of any Vocaloid with 5327456 views and 477046 mylists, and Len managed with 4555580 views and 413901 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’s was 1895.22/169.71. However, when the views were based on the more accurate mean total number of views, Len and Rin rounded out the top six with 355 views/16 mylists and 349 views/16 mylists respectively per video coming bottom of the top 6 Vocaloids. The Kagamine software was the only Vocaloid package to be be in all top 6 lists besides Gumi.[32]

The Appends for the Kagamine Vocaloids were better received than the Miku Append, though they did not sell as well overall as the Miku Append and did not remain in the top ten Crypton Future Media software rankings.

Google Trends "Kagamine Rin"

Google Trends "Len vs. Rin" in Japan


  • 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 word could be either, the English version has been confirmed as "Rin and Len" and 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.
  • On the Mikunopolis website their profile reads the following statement: "The Kagamine twins are well known for their very clear and precise vocals". Considering their history of lack of clarity and/or pronunciation problems, as well as Act 2 of the software missing a pronunciation entirely, this is a little bit of an exaggeration on the webhost's part. Also the statement, "Just with a few tweaks here and there they could sing almost any other genres as well," is also somewhat questionable due to their reputation of requiring previous experience to use and often at times needed more than just a few tweaks to make them work.[34]
  • 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.
  • With a total of 10 voicebanks, Asami Shimoda is the vocal provider with the most Vocaloid voicebanks for commerical sale based on any single vocaloid provider. This also makes the Kagamine package the most expansive set of vocals within the Vocaloid 2 era and to date the most of any Vocaloid package. However, most new users will only have access to 8 vocals due to the original's retirement.
  • Continuing the tradition of the Item War Internet Meme, many items were preposed for the pair. In the end, Len's item was a Banana because his hair was commented to resemble a bunch of bananas, 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 recieved many views suddenly on December 1, 2007. Kagamine Len had yet to be revealed at the time of the Road Roller meme.[35]
  • In piano sheet music, the Bass-clef is played with the left hand, while the Treble-clef is played with the right hand. It is believed that this is used for Rin and Len's names (Right for Rin and Left for Len). There is also a Treble-clef on Rin's shirt and a Bass-clef on Len's shirt.

Notable for...

  • First and only dual voicebanks released with two "Vocaloids" in one package
  • First Vocaloids to be updated
  • First male (Len) released for Vocaloid 2
  • First vocal (Len) released not to be the same gender as the provider
  • First male (Len) to be Appended


External links

links and passwords are provided publicly by model producer(s), within video summaries (Nakao) - (sm12806666) 鏡音リン_n式ver1.04
NicoVideo (Mqdl) - (sm13010409) 【MMD】リンAppendモデルでリンリンリンってしてくりん ( (Dede) - (sm13422693) でで式鏡音レンAPPEND1.0.2 (Dede) - LenAPPDDv1.1


  1. link
  2. link
  3. [1] Official Profile Asami Shimoda
  4. [2] Asami Shimoda's Blog
  5. "VOCALOID MANIACS","DTM magazine"15(1)(No.165, 2008.1, Published by Terashima Jouhou Kikaku, P26
  6. [3] 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)
  7. More versions of this song
  8. link
  9. proof
  10. link
  11. link
  12. link
  13. [4] Crypton Rin/Len Kagamine act2
  14. [5] Richier - Hatsune Miku Note May 29, 2008
  15. [6] Nico Nico Gosanke Wiki: Rin Kagamine
  16. [7] Tweets - 8:50 PM Apr 12th, 2011
  17. [twitter]
  18. [8] Crypton - Rin and Len Append
  19. [9] 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!)
  20. [10] 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?)
  21. [11] 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")
  22. Nikkei Electronics (973) Mar.10,2008,126-127, ISSN 0385-1680
  23. "VOCALOID wo Tanoshimou Vol.2" published by Yamaha Music Media,2009, Page 47, ISBN 978-4-636-84438-2
  24. [12] P-Tina - Interview(s) with Crypton and KEI
  25. VocaloidOtaku - Our Favorite VOCALOIDS: Interview with KEI
  26. [13] Vocaloidism - Hatsune Miku Live in Los Angeles: Mikunopolis
  27. [14] Hidekyan Blog - (requires WindowsMediaPlayer)
  28. link
  29. [15] DTM Magazine - CV02 鏡音リン・レンACT2 (CV02 Kagamine Rin/Len ACT2)
  30. [16] Amazon/jp - Rin/Len Kagamine
  31. [17] 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)
  32. link
  33. [18] 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)
  34. link
  35. link


Start a Discussion Discussions about Kagamine Rin/Len

  • (Poll) Most and Least favorite Crypton Vocaloid

    356 messages
    • I'm not a fan of Crypton's Vocaloids in general tbh, but here's my ordering of them, from most to least favourite. 1. KAITO - I don't really k...
    • My top: >Rin >Luka >Len >Miku >MEIKO >KAITO MEIKO and KAITO are fairly tied for me, but I guess I favor MEIKO's voice a little more.
  • kagamine len different designs

    6 messages
    • wrote: Does anyone have good pictures they can share There are links to deviantART, Pixiv, and Piapro- at the bottom of ev...
    • Umbreon126 wrote: We can, but we've decided to create rules saying "no". Yeah, that was to "keep the peace" between us and fanartists and ...

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