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Mayuzumi Kai (黛灰) was a male Japanese Virtual YouTuber affiliated with NIJISANJI. He debuted alongside Ars Almal and Aiba Uiha, known as the trio "Blues" (ぶるーず).

Introduction Video[]

【初配信】どーも。ハッカーの黛灰。【黛_灰_にじさんじ】

【初配信】どーも。ハッカーの黛灰。【黛 灰 にじさんじ】

Mayuzumi's debut stream.

Profile[]

An aloof and talented white-hat hacker who began live streaming as part of an undercover investigation. He rarely goes outside and orders everything online.[1]

Personality[]

Cool-headed and reserved, Mayuzumi was known for his monotone way of speaking and his blunt and sarcastic humour. He would often speak casually to his seniors instead of using polite speech, much to their annoyance [2]. Mayuzumi would often suddenly act out of character through exaggerated voice acting or peculiar video editing; most famously, at the suggestion of his viewers he completely reversed his personality and acted in an energetic and polite manner.

As shown through his frequent collab and call-in livestreams, he got on well with many livers including those outside of NIJISANJI such as Natsuiro Matsuri from hololive.[3], and his own illustrator Ichijiku.[4]

Due to his quiet personality, others often become excited if they are able to make him laugh.

Aside from the usual VTuber game titles, he most often plays indie games.

Appearance[]

He has short, slightly asymmetrical black hair with a greenish-teal part on the side with black piercings and light green eyes.

History[]

Background[]

Mayuzumi made his YouTube debut on 29 July 2019.

2019[]

On 29 July, Mayuzumi reached 10,000 subscribers on his YouTube channel.[5]

On 17 August, Mayuzumi reached 50,000 subscribers on his YouTube channel.[6]

On 10 October, Mayuzumi reached 100,000 subscribers on his YouTube channel.[7]

On 15 October, he revealed he had cataracts in both of his eyes and would have to limit his streaming frequency as they were treated.[8]

2020[]

On 28 January, Mayuzumi reached 150,000 subscribers on his YouTube channel.[9]

In February he resumed regular streaming after recovering from surgery to remove the cataracts.

On 15 May, Mayuzumi reached 200,000 subscribers on his YouTube channel.[10]

On 3 July, Mayuzumi announced he would be in his official 3D model debut on 10 July.[11] He unveiled his official 3D model on 10 July as scheduled.

On 24 September, Mayuzumi reached 250,000 subscribers on his YouTube channel.[12]

On 31 December, Mayuzumi reached 300,000 subscribers on his YouTube channel.[13]

2021[]

On 5 March, Mayuzumi reached 350,000 subscribers on his YouTube channel.[14]

On 16 June, Mayuzumi broadcasted a lore video in the real-world Akihabara.[15] In this video, he acknowledged his own nature as a fictional character and speculated on the relationship between his world and the real world.

On 28 June, Mayuzumi reached 400,000 subscribers on his YouTube channel.[16]

On 11 September, Mayuzumi reached 450,000 subscribers on his YouTube channel.[17]

On 3 December, Mayuzumi announced that he decided to take a break from streaming at least until February 2022.[18] Later on a stream, he mentioned that the reason was because he had been developing mild symptoms of depression and visibly worsening. The symptoms had affected his health such as making it harder for him to concentrate, experiencing insomnia, and developing fevers, to the point of him needing to take short breaks previously. However, he would still appear on official NIJISANJI channel and regular shows, as well as sponsorship events he had planned prior to the decision.[19]

  • On 14 December, Mayuzumi gave an updated announcement that NIJISANJI management had stopped him from continuing his appearance in NIJISANJI official programs and regular shows including NijiQuiz in concern to his health; and that he would be absent from NijiQuiz starting from 16 December 2021's episode.[20]

2022[]

On 27 February, Mayuzumi reached 500,000 subscribers on his YouTube channel.[21][22]

On 8 May, Mayuzumi made appearance as narrator and guest on his fellow Mescher's group-mates Fuwa Minato and Saegusa Akina's FuwaGusa 3D LIVE stream #ふわぐさ3Dライブ titled "Dream that came true" (叶えたかった夢, Kanaetakatta Yume) on Minato's channel.[23]

Retirement[]

On 2 July, Mayuzumi announced that on his 3rd debut anniversary on 28 July 2022, along with the end of his contract with NIJISANJI, he would be also graduating.[24]

  • He explained the reason for his graduation through the graduation announcement stream that around November 2021 he was approached by ANYCOLOR management to talk about the future plan, but the plan suggested to him was not aligned with the direction of ideas and plans he projected back in August 2021; after long discussions and proposals up until February 2022, and with no common ground found, he decided to graduate from ANYCOLOR and NIJISANJI.[25] Along with his graduation, while his YouTube channel and Twitter account would be still available publicly, some archives would be made unlisted (they would be still viewable but not on the top page of his channel).
  • Up until the day of his graduation, he would be either streaming or posting videos everyday.
  • On the same day, Mayuzumi reached 550,000 subscribers on his YouTube channel.[26]

On 13 July, Mayuzumi reached 600,000 subscribers on his YouTube channel.[27]

On 27 July, Mayuzumi held a funeral-themed totsumachi stream in celebration of 600K subscribers and his graduation where he talked to various Livers and creators, including other members of NIJISANJI (including EX-IDs, EX-KRs, NIJISANJI EN, and VirtuaReal), hololive and HOLOSTARS, and VSPO!. The stream amounted to 20 hours over the course of 3 streams and over 96 creators participated. It was also one of the few instances where Mayuzumi enabled superchats on his streams.[28]

On 29 July, upon graduation, Mayuzumi tweeted his final tweet, the almost same message as shown at the end of his final stream.

THE END. The story does not continue.
~ Mayuzumi Kai on Twitter
TH3 3ND. TH3 2TORY DO32 NOT CONT1NU3.
~ Mayuzumi Kai on YouTube

Post-Retirement[]

On 30 July, despite having already graduated, Mayuzumi reached 700,000 subscribers on his YouTube channel.

Events[]

2021[]

2022[]

Fans[]

  • The name for his fans is "ListeNerds".
    • On 5 March 2021, he tweeted that he doesn't officially recommend the use of this fan name or his oshi mark anymore. So it is fine for fans to use whatever they would like instead.[31]
  • He begins livestreams with his famous "Do-mo" (どーも lit. Hello) catchphrase.

Relationships[]

Trivia[]

  • Color: #086776 [33]
  • Mayuzumi has a mascot called Uchina Irokichirou who is based on the color of his inner hair. Irokishirou is a turquoise strand of hair wearing a happi, traditional Japanese festival wear, and a headband. He speaks in an old Edo speech/dialect, and has very loud and energetic but masculine and old-fashioned mannerisms.
  • His favourite anime is Serial Experiments Lain [34]
  • He is weak to horror games.
  • He uses "X" in his Twitter username as the Greek letter "χ" can be pronounced "Kai".
    • As "χ" can also be pronounced "Chi", he uses it in his channel header for the phrase "Mayuzumi χannel"
  • He wrote the lyrics to Aiba Uiha's first original song, "Yume e Mukatte Maenarae!".[35]
  • He typically avoids singing. He has mentioned that he doesn't have a sense of rhythm and seems to be nervous about the expectations put into his singing skills.
    • On 22 August 2021, Aiba Uiha premiered what appeared to be a duet cover of Turing Love with Mayuzumi, but instead of Mayuzumi himself singing, the cover featured a voice synthesizer that resembled his voice.
  • He is left handed.
  • Mayuzumi's channel is only monetized to a minimum. He usually doesn't have Super Chats on for his streams nor does he have a membership available for his channel. When he does switch on Super Chats for a stream (usually special occasions like anniversary streams), he usually is showered in them while fans still can.
    • When asked by Tamaki in a collab stream as to why he doesn't switch on SC, he mentioned that he finds it bothersome as they take up more space in the chat column, which would make it harder to read the rest of the chat. It also boosts his Voice Packs, which fans buy instead as a means to support him monetarily.[36]
    • He has pondered in a stream about opening membership if he could put the fee at 1M yen in an attempt to raise the price so high that no one would dare to purchase the membership. When asked what he would do if someone would actually pay that sum, he replied that he would run away.[37]
  • He is part of the 2434system, a storyline that attempts to create a red string between the lore of Nijisanji's Vtubers.

External Links[]

Media[]

Twitter hashtags[]

Further readings[]

Nijisanji logo (V T E)
First Generation Tsukino Mito (🐰)Elu (🗼)Higuchi Kaede (🍁)Shizuka Rin (💜)Shibuya Hajime (🌱)Suzuya Aki (🐈)Moira (😇)
Retired Yuki Chihiro (🎀💙)
Second Generation Mononobe Alice (♥️♠️♦️♣️)Fushimi Gaku (✌)Ienaga Mugi (🌷)Morinaka Kazaki (🐻)Suzuka Utako (🎶)Ushimi Ichigo (🍓)Yuhi Riri (🌇)Kenmochi Toya (⚔️)Gilzaren III (🏰🌕)Fumino Tamaki (🐟)
Gamers(1) Kanae (🔫)Akabane Youko (💀)Sasaki Saku (🎋)Honma Himawari (🌻)Makaino Ririmu (🍼)Kuzuha (🎲)Shiina Yuika (👻)
Retired Yamiyono Moruru (🍜)Setsuna (❄️)
SEEDs(1) Dola (🔥)Hanabatake Chaika (🌵)Ryushen (🐼)Sister Claire (🔔)Suzuki Masaru (☪)Todoroki Kyoko (🐐)Uzuki Kou (🌙)Yashiro Kizuku (🖥)Kanda Shoichi (🔪)Amemori Sayo (☔️)Takamiya Rion (🦅)Asuka Hina (🐤)Maimoto Keisuke (👨‍🌾)Debidebi Debiru (🚪👿)Rindou Mikoto (🍶⚜️)Joe Rikiichi (🤡🎈)Machita Chima (🐹)Sakura Ritsuki (🌸🌙)Belmond Banderas (🥃)Yaguruma Rine (🌽)Yumeoi Kakeru (🎤)Kuroi Shiba (🐕🐾)
Retired Hassaku Yuzu (🍊)Nakao Azuma (☀️)Naruto KoganeUmiyashano Kami (⛩)Tsukimi Shizuku (🎑💊)Achikita Chinami (🍬)Izumo Kasumi (🦑)Azuchi Momo (🍑)
VOIZ Harusaki Air (🍭)Naruse Naru (🎙)Kaminari Poaro (retired)Kurohane Kuroto (retired)
2019 Wave Yuzuki Roa (🌖)Onomachi Haruka (♨️)Kataribe Tsumugu (📘🧂)Seto Miyako (📷💚)Inui Toko (🍹)Ange Katrina (⚖)Lize Helesta (👑)Saegusa Akina (🌶)Aizono Manami (🦀💕)Yukishiro Mahiro (🌐✨)Ex Albio (🛡)Levi Elipha (🔲)Hayama Marin (🍃🗻)Nui Sociere (🎃)Hakase Fuyuki (⚗)Kagami Hayato (🏢)Yorumi Rena (🎩🐤)Ars Almal (📕)Amamiya Kokoro (🎐)Eli Conifer (🌲)Ratna Petit (🐻💎)Hayase Sou (🏃‍♀️💨)Sukoya Kana (💉💘)Shellin Burgundy (🧐)Fumi (🔖)Hoshikawa Sara (🌟)Yamagami Karuta (🎴)Matsukai Mao (💥)Emma★August (★)Luis Cammy (❤️🦋)Fuwa Minato (🥂✨)Shirayuki Tomoe (👠⛓️)Gwelu Os Gar (😎)Mashiro (🧷)Naraka (✖🍳)Kurusu Natsume (🐏🎵)
Retired Aiba Uiha (🍮💎)Mayuzumi Kai (💻💙)Warabeda Meiji (🐺🍎)Kudou Chitose (🧠)Shindo Raito (terminated)Otogibara Era (🏰🕛)Suzuhara Lulu (🎨)Gundo Mirei (🐽)
2020 Wave Furen E Lustario (🎠)Ibrahim (💧)Nagao Kei (☯️)Genzuki Tojiro (🎻🛵)Kaida Haru (🌞)Sorahoshi Kirame (🌌)Suo Sango (💞🦩)Todo Kohaku (🍯)Kitakoji Hisui (✳)Nishizono Chigusa (🐬🌱)
Retired Kingyozaka Meiro (🩰)Melissa Kinrenka (🐝)Asahina Akane (🦖🎖)
2021 Wave Lauren Iroas (🗝💸)Leos Vincent (🥼🌱🐱)Oliver Evans (🍵)Lain Paterson (❤️‍🔥)
Retired Axia Krone (🐈‍⬛)
2022 Wave Umise Yotsuha (🍀)Amagase Muyu (💭)Ponto Nei (🫐)Hyakumantenbara Salome (💯🦂)Fura Kanato (🍝🍷)Watarai Hibari (♦️☕️)Shikinagi Akira (📄🖋)Seraph Dazzlegarden (🦉)
2023 Wave Igarashi Rika (⚾️🧡)Koshimizu Toru (🫧)Ishigami Nozomi (❤️‍🩹)Sophia Valentine (🐰🗞️)Kuramochi Meruto (🧸🌙)Kaburaki Roco (🍕🎢)Shishido Akari (🐱💫)Akagi Wen (🍱🦖)Usami Rito (🌩️)Hibachi Mana (🐝🤣)Saiki Ittetsu (🤝)Murakumo Kagetsu (🥷🔫)Hoshirube Sho (🐙🌟)Koyanagi Rou (👻🔪)Inami Rai (💡)Tachitsute Toto (🪓🎀)Shioriha Ruri (🚓🐾)Milan Kestrel (🦋⏳)
2024 Wave Kitami Yusei (📿🍔)Kaisei (🔑🐍)Sakaki Ness (🫖🌿)Tamanoi Nana (🛼)Shiga Riko (📒)Kisara (🪞) Kozue Mone (🪷)Lunlun (🥨🍚)Nanase Suzuna (🥗)Saotome Berry (🍰🧁)Kirara Tamako (🐣📛)Sakayori Soma (🍇)Nagisa Trout (🐟🍴)
NIJISANJI ID(2) Hana Macchia (☕)Rai Galilei (🚨)Riksa Dhirendra (💥)Layla Alstroemeria (🕰️🌺)Etna Crimson (🌋🍔)Bonnivier Pranaja (🎣)Nagisa Arcinia (🐥🍭)Derem Kado (🎁)
Retired Miyu Ottavia (🦦)ZEA Cornelia (🔶)Taka Radjiman (🍖)Siska Leontyne (🔦🦁)Amicia Michella (🐧)Azura Cecillia (👽)Nara Haramaung (🐯)Reza Avanluna (🌒🎸☁)Hyona Elatiora (🐾🏵)Xia Ekavira (⚗️ 🎼)Mika Melatika (👻📌)
NIJISANJI KR(2) Min Suha (🌊)Gaon (👔)So Nagi (🌧)Akira Ray (😸)Lee Roha (🔰)Yang Nari (📌)Ryu Hari (👁‍🗨)Oh Jiyu (⚜️)Seffyna (💗🌕)Ban Hada (🏴‍☠️)Ha Yun (🎮 🦭🍔)Na Sera (🌸🌙)
Retired Chae Ara (🌹💛)Han Chiho (🌑🦋)Song Mia (🍡)
NETWORK(3) Tenkai Tsukasa (🎲)Fairys-chan (🐦)
Intl. branches VirtuaRealNIJISANJI ID (merged branch)NIJISANJI IN (dissolved branch)NIJISANJI KR (merged branch)NIJISANJI EN
(1) Programs merged with main NIJISANJI group.

(2) Indonesia and Korea branches merged with main NIJISANJI branch.
(3) Program terminated; members are active but are no longer affiliated with NIJISANJI.

References[]

  1. Mayuzumi Kai's corporate profile [Webpage]. (n.d.). nijisanji.jp.
  2. Mayuzumi K. [黛灰/Kai Mayuzumi【にじさんじ】]. (2019, August 11). 【ProjectWinterコラボ】この中に二人、裏切り者がおる。お前やろ!【黛 灰 / にじさんじ】 [Video]. YouTube.
  3. Mayuzumi K. [黛灰/Kai Mayuzumi【にじさんじ】]. (2020, August 29). 【祝】なんの記念でもない凸待ち【黛 灰 / にじさんじ】 [Video]. YouTube.
  4. Mayuzumi, K. [黛灰/Kai Mayuzumi【にじさんじ】]. (2020, June 27). 【20万人記念】スペシャルゲストを呼んで、話してみたかったことを話す。【黛 灰 / にじさんじ】 [Video]. YouTube.
  5. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2019, July 29). Mayuzumi Kai 16,000 subscribers milestone [Twitter Bot]. Twitter.
  6. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2019, August 17). Mayuzumi Kai 50,000 subscribers milestone [Twitter Bot]. Twitter.
  7. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2019, October 10). Mayuzumi Kai 100,000 subscribers milestone [Twitter Bot]. Twitter.
  8. Mayuzumi, K. [@mayuzumi_X]. (2019, October 15). というわけでメガネ作りに行ったら目の病気発覚した。配信で話したとおりそんなに深刻じゃないけど、アレルギーとかで若くしてなるケースもあるっていうことでみんなも気をつけて。 [Tweet]. Twitter.
  9. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2020, January 28). Mayuzumi Kai 150,000 subscribers milestone [Twitter Bot]. Twitter.
  10. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2020, May 15). Mayuzumi Kai 200,000 subscribers milestone [Twitter Bot]. Twitter.
  11. Mayuzumi, K. [@mayuzumi_X]. (2020, July 3). 3D Model Debut Stream Announcement [Tweet]. Twitter.
  12. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2020, September 24). Mayuzumi Kai 250,000 subscribers milestone [Twitter Bot]. Twitter.
  13. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2020, December 31). Mayuzumi Kai 300,000 subscribers milestone [Twitter Bot]. Twitter.
  14. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2021, March 5). Mayuzumi Kai 350,000 subscribers milestone [Twitter Bot]. Twitter.
  15. Mayuzumi, K. [黛 灰 / Kai Mayuzumi【にじさんじ】]. (2021, June 20). 2021年6月19日の様子 (Mayuzumi Kai's Akihabara broadcast) [Video]. YouTube.
  16. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2021, June 28). Mayuzumi Kai 400,000 subscribers milestone [Twitter Bot]. Twitter.
  17. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2021, September 11). Mayuzumi Kai 450,000 subscribers milestone [Twitter Bot]. Twitter.
  18. Mayuzumi, K. [@mayuzumi_X]. (2022, December 3). Mayuzumi is taking a break until February 2022 [Tweet]. Twitter.
  19. Mayuzumi, K. [黛 灰 / Kai Mayuzumi【にじさんじ】]. (2021, December 3). 【報告】ちょっとお休みする(※配信後限定公開になる)【黛灰/にじさんじ】 [Unlisted Video]. YouTube.
  20. Mayuzumi, K. [@mayuzumi_X]. (2021, December 14). https://twitter.com/mayuzumi_X/status/1470617219013165057 [Tweet]. Twitter.
  21. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2022, February 27). Mayuzumi Kai 500,000 subscribers milestone [Twitter Bot]. Twitter.
  22. Mayuzumi, K. [@mayuzumi_X]. (2022, February 28). Mayuzumi Kai 500,000 subscribers milestone [Tweet]. Twitter.
  23. NIJISANJI Official [@nijisanji_app]. (2022, May 8). Fuwa Minato and Saegusa Akina 3D Live Stream [Tweet]. Twitter.
  24. Mayuzumi, K. [@mayuzumi_X]. (2022, July 2). さっきの配信でお知らせさせてもらった通り 7月28日を以てANYCOLOR株式会社との契約を解消し活動を終了することになった。 経緯等に関しては配信で話している内容の方がより正確伝わると思うので、そちらを見て貰えると。 辞めるまでの間は毎日何かしら配信・動画を公表する。 予定表は以下の通り。 [Tweet]. Twitter.
  25. Mayuzumi, K. [黛 灰 / Kai Mayuzumi【にじさんじ】]. (2022, July 2). 【告知】お知らせとか告知とかもろもろのやつ。【黛灰 / にじさんじ】 [Video]. YouTube.
  26. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2022, July 2). Mayuzumi Kai 550,000 subscribers milestone [Twitter Bot]. Twitter.
  27. NIJISANJI YouTube Subscribers Counter Bot [@2434subscriber]. (2022, July 13). Mayuzumi Kai 600,000 subscribers milestone [Twitter Bot]. Twitter.
  28. Mayuzumi, K. [@mayuzumi_X]. (2022, July 27). 参加受け付け範囲は以下の通り。最低を60人として、話せる限りの人と話したいと思っているので、よかったら一緒に盛り上げて欲しい。 [Tweet]. Twitter.
  29. マインクラフト 日本公式 / Minecraft Japan [@minecraftjapan]. (2021, September 18). https://twitter.com/minecraftjapan/status/1439161122897031170 [Tweet].
  30. マインクラフト 日本公式 / Minecraft Japan [@minecraftjapan]. (2022, April 2). https://twitter.com/minecraftjapan/status/1510150286744072195 [Tweet].
  31. 黛 灰(まゆずみ かい)@にじさんじ [@mayuzumi_X]. (2021, March 5). https://twitter.com/mayuzumi_x/status/1367755780686893060 [Tweet]. Twitter.
  32. Official spelling seen on the website for Shibuya Hal's third VTuber Apex Legends tournament, in which Mescher's participated in
  33. Based on Itsukara's .link page
  34. Mayuzumi, K. [@mayuzumi_X]. (2019, July 24). Marshmallow response [Tweet]. Twitter.
  35. Mayuzumi, K [@mayuzumi_X]. (2020, July 28). 作詞した曲はこれ。 [Tweet]. Twitter.
  36. Inuyama, T. [Tamaki Ch. 犬山たまき / 佃煮のりお]. (2020, November 3). 【黛灰】スーパーハカー襲来!?ヤバイ企画やってるってマジ?まゆ×たま対談バトル!!【犬山たまき】#まゆたま [Video]. YouTube.
  37. Mayuzumi, K. [黛 灰 / Kai Mayuzumi【にじさんじ】]. (2020, December 25). 雑談陸くんからのお歳暮知らないうちに返送されてた黛灰にじさんじ [Video]. YouTube.
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