Software:Kasane Teto

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Kasane Teto
File:Kasane Teto Logo.svg
Artwork depicting Kasane Teto's original UTAU design.
Developer(s)
  • TwinDrill
  • AH-Software Co. Ltd.
Initial release1 April 2008; 17 years ago (2008-04-01)
Stable release
Kasane Teto AI ver 104 / 3 April 2023; 2 years ago (2023-04-03)
EnginesUTAU, Synthesizer V Studio, VOICEPEAK
Available in
  • Japanese
  • English
TypeSinging voice synthesizer
LicenseProprietary
Websitekasaneteto.jp
Kasane Teto
First appearanceScript error: No such module "Formatted appearance".
Last appearanceScript error: No such module "Formatted appearance".
Designed bySen (線)
Voiced byOyamano Mayo
Information
Full nameTemplate:Nihongo krt
GenderChimera[lower-alpha 1]

File:JamieP - Machine Love (Snippet, Vocals Only).ogg

Kasane Teto (Japanese: 重音テト, ja) is a virtual singer software created on the Japanese textboard 2channel for April Fools' Day 2008.[2] Despite the fact that Teto was initially created as a joke, an actual voicebank was created for her using voice synthesis software UTAU, which allowed her to sing. Teto has been introduced as a "diva born from a hoax".[3]

Kasane Teto was also released as a voice model in 2021 for TALQu,[4] a deep learning-based free speech software, in 2023 for Synthesizer V AI,[5] a commercial singing voice synthesis software, and in 2025 for VOICEPEAK,[6] a text-to-speech software.

Character

Kasane Teto is officially stated to be 31 years old.[1] In her earliest design, she was 159.5 centimetres tall and weighed 47 kilograms. She is listed as liking baguettes (which she is frequently depicted with in fanart) and being a tsundere.[7]

Kasane Teto is portrayed as a youthful girl with reddish hair styled in spiraling twintails resembling drill bits, a style her developers refer to as "twindrills." She typically wears a uniform-style outfit with a red and black color scheme, which has become a recognizable part of her image.

Her personality is generally portrayed as mischievous.

History

Creation

Kasane Teto's origins come from 2channel, a Japanese bulletin board. In 2008, a group of users devised a plan to make a fake Vocaloid character. Character names, hairstyles, genders, ages, likes, dislikes, special skills, and other traits were randomly selected from among the suggestions of 2channel users and consolidated into a single character, which would be shown as a prank for April Fools' Day. On 6 April 2008 she appeared for the first time on video, and on 13 April 2008, the first voicebank for Teto was released, with Oyamano Mayo as the voice provider. The first song using her voice was released on 1 June 2008.[8][7]

The rights holders who provided the character design and voice of Kasane Teto established the circle "TWINDRILL" in 2009 to promote and manage the character. Although Kasane Teto was a parody character of Crypton Future Media's series of Vocaloid singers, Twindrill organised the rights and established a cooperative relationship with Crypton from 2009 to 2010. Since 2010, Crypton has been the point of contact for commercial use.[3]

2010s and 2020s

Teto continued to make an impact on the Vocaloid community, with many songs being released. In 2012, a DLC pack for Software:Hatsune Miku: Project DIVA F featured her.[9] In 2013, she appeared as a part of Hatsune Miku's act in the Sapporo Snow Festival.[10]

Synthesizer V

File:BIRDBRAIN (w OK Glass) feat. Kasane Teto.webm For the 15th anniversary of Teto on 1 April 2023, Japanese software developer AH-Software announced they would be partnering with Twindrill and Crypton Future Media to produce a Synthesizer V AI voice database for the character, its first full commercial release. On 3 April 2023, Kasane Teto AI version 104 was announced. For the occasion, a significant redesign was made, giving Teto a new outfit to stand apart from being a Hatsune Miku parody. The deep learning technology in Synthesizer V made use of singing from the voice provider rather than concatenative phoneme samples like UTAU. This allowed for cleaner, more natural synthesis and various features such as "Vocal Modes" for expression and the ability to sing in any language that Synthesizer V AI supports via "cross-lingual synthesis". Synthesizer V AI Kasane Teto was released on 27 April 2023, and has received frequent updates.[8][11] A limited "lite" voice database for the same software was released soon after on 8 May 2023, available for free download.

VOICEPEAK

For Teto's 17th anniversary on 1 April 2025, AH-Software announced an adaptation of Kasane Teto's voice for their VOICEPEAK (ja) Japanese text-to-speech software, which was released shortly after on 24 April 2025.[6]

Voicebanks

List of Kasane Teto Voicebanks
Language Release Software
Japanese[12] 1 June 2008 UTAU
English[12]
Multilingual[8] 27 April 2023 Synthesizer V
Japanese[6] 24 April 2025 VOICEPEAK

Reception

Despite not being a Vocaloid character, Kasane Teto has gained popularity among Vocaloid and UTAU fans.[13] Within six months of her release, more than 500 videos with the "Kasane Teto" tag were published on Niconico, and the song 嘘の歌姫 (Uso no utahime, "A Fake Diva") featuring Kasane Teto reached 100,000 views, entering the Vocaloid Hall of Fame.[14] According to stats from the 2025 Music Awards Japan, 5 out of the top 10 most popular Vocaloid tracks in Japan featured Kasane Teto, notably surpassing Hatsune Miku who was featured in 3. Among songs nominated for the 2025 Best Vocaloid Culture Song award, Teto was the second most used voice behind Miku.[15]

Cosplay of Kasane Teto

Notable songs

Charted songs with vocals by Kasane Teto
Title Artist Year Peak chart positions YouTube Views Template:Ref.
JPN
Hot 		JPN
Niconico Vocaloid
"Override" Yoshida Yasei 2023 75 1 78M [16][8]
"Mesmerizer" Satsuki / 32ki 2024 65 1 147M [17][18]
"Tetoris" Hiiragi Magnetite 35 1 78M [19][20]
Kasane Teto songs with awards and nominations
Awards Category Song Artist Year Result Template:Ref.
2025 Music Awards Japan Best Vocaloid Culture Song "Override" Yoshida Yasei 2023 Nominated [15][21]
"Medicine" ("Igaku") Sasuke Haraguchi 2024
"Mesmerizer" Satsuki / 32ki
"Tetoris" Hiiragi Magnetite

Other media

Kasane Teto has appeared in many different media, such as in Sega's music game franchise Software:Hatsune Miku: Project DIVA, becoming a promotional character for Hokkaido Broadcasting, having Nendoroid and other plastic figures from Good Smile Company, performing with Nakamura Shidō II on the Kabuki stage, and having novel adaptations.[14]

Notes

  1. ↑ Teto's gender, like most of her attributes, was chosen at random from suggestions on 2channel. It is unclear if this is her actual gender, or if it is simply her species. According to TwinDrill, she is generally seen as a female due to her appearance and voice, but fans are free to interpret.[1]

References

  1. ↑ 1.0 1.1 "KASANE TETO Official Site Q&A". https://kasaneteto.jp/about_qa3.html. 
  2. ↑ "Kasane Teto to wa?" (in ja). Twindrill. https://kasaneteto.jp/about/. 
  3. ↑ 3.0 3.1 Takigawa, Kyoko (27 April 2023). "Uso kara Umareta Utahime ｢Kasane Teto｣ Parodi ga「Honmono」no Shōgyō Shifuto made ... Ayunda Jūgonen" (in ja). J-Cast, Inc. https://www.j-cast.com/2023/04/27460462.html?p=all. 
  4. ↑ "TALQu Voice Model Data". Twindrill. https://kasaneteto.jp/talqu/. 
  5. ↑ "Tanjō kara Jūgonen, Ooku no Kata ga Aisareta Ano Kyrakuta ga AI Detabesu ni! ｢Synthesizer V AI Kasane Teto｣ Nisennijūnen Shigatsu Nijunananichi Hatsubai" (in ja). AHS Co. Ltd. 3 April 2023. https://www.ah-soft.com/press/synth-v/20230403.html. 
  6. ↑ 6.0 6.1 6.2 "Daininki kyarakutā ga tōku sofuto de tōjō! Nyūryoku moji yomiage sofuto 'VOICEPEAK Kasane Teto' 4/24 hatsubai!" (in ja). AHS Co. Ltd. 1 April 2025. https://www.ah-soft.com/press/voice/20250401.html. 
  7. ↑ 7.0 7.1 "重音テト・オフィシャルサイト" (in ja). https://kasaneteto.jp/about/. 
  8. ↑ 8.0 8.1 8.2 8.3 "Japan's Vocaloid Scene: Top Trend for the First Half of 2024 Is 'Room for Interpretation'". Billboard (Penske Media Corporation). 2024-09-13. https://www.billboard.com/music/music-news/japan-vocaloid-scene-top-trend-2024-mid-year-room-for-interpretation-1235775210/. 
  9. ↑ Sahdev, Ishaan (6 November 2012). "Hatsune Miku: Project Diva f DLC Adds "Unofficial" Vocaloids Neru, Haku And Teto" (in en-US). https://www.siliconera.com/hatsune-miku-project-diva-f-dlc-adds-unofficial-vocaloids-neru-haku-and-teto/. 
  10. ↑ Loo, Egan (3 February 2013). "Snow Miku Revealed for Sapporo Snow Festival 2013". https://www.animenewsnetwork.com/interest/2013-02-03/snow-miku-revealed-for-sapporo-snow-festival-2013. 
  11. ↑ Bueno, Daniel (4 April 2023). "Kasane Teto Synthesizer V Vocaloid Voice Arrives in April" (in en-US). https://www.siliconera.com/kasane-teto-synthesizer-v-vocaloid-voice-arrives-in-april/. 
  12. ↑ 12.0 12.1 "UTAU sound source download" (in ja). Twindrill. https://kasaneteto.jp/utau/. 
  13. ↑ "Nikkei Shimbun Shasetsu de JASRAC wo Hinikuru" (in ja), Daily Cyzo, 6 May 2008, https://www.cyzo.com/2008/05/post_539_entry.html, retrieved 17 June 2024 
  14. ↑ 14.0 14.1 "Rekishi･Nepyō" (in ja). Twindrill. https://kasaneteto.jp/history/. 
  15. ↑ 15.0 15.1 "MUSIC AWARDS JAPAN’s Best Vocaloid Culture Song Entries Highlight Different Domestic & International Trends" (in en-US). 2025-04-22. https://www.yahoo.com/entertainment/articles/music-awards-japan-best-vocaloid-190833153.html. 
  16. ↑ "Yoshida Yasei Chart History on Billboard Japan". Billboard Japan. https://www.billboard-japan.com/artists/detail/1059931. Retrieved January 30, 2025. 
  17. ↑ "32ki Chart History on Billboard Japan". Billboard Japan. https://www.billboard-japan.com/artists/detail/1061373. Retrieved January 30, 2025. 
  18. ↑ "ニコニコ VOCALOID SONGS TOP20" (in ja). Hanshin Contents Link Corporation. 2024-05-13. https://www.billboard-japan.com/charts/detail?a=niconico&year=2024&month=05&day=13. 
  19. ↑ "Hiiragi Magnetite Chart History on Billboard Japan". Billboard Japan. https://www.billboard-japan.com/artists/detail/963553. Retrieved January 30, 2025. 
  20. ↑ "ニコニコ VOCALOID SONGS TOP20" (in ja). Hanshin Contents Link Corporation. 2024-11-13. https://www.billboard-japan.com/charts/detail?a=niconico&year=2024&month=11&day=18. 
  21. ↑ "Winners for “MUSIC AWARDS JAPAN 2025” 1st Day Announced – NanteJapan" (in en-US). https://nantejapan.com/winners-for-music-awards-japan-2025-1st-day-announced/. 



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