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This page is about the YT singer kuma☆/MastaH, not to be confused with the female utaite Kuma (くま).
A sample of a cover song by Kuma☆
"Undead Enemy", composed by Suzumu & GigaP

kumaboshi (stylized as kuma☆), formerly known as MastaH (マスタ), is a YouTube singer. They have over 5,000 subscribers as of December 2015.

Their singing is described as slightly nasally, and they are able to reach significantly high notes with plenty of emotion, strength, as well as smooth transition. They may sometimes deepen their voice to pull off a lower and rougher sound, such as in their cover of "Tokyo Teddy Bear" or "Ayano no Koufuku Riron". They can also sing in grunt vocal, such as in their "scythe weasel".

Further remarkable aspects of their singing include their vast range, along with their ability to produce adlibs and harmonies easily, as demonstrated in their collab of "風に薫る夏の記憶" (Kaze ni Kaoru Natsu no Kioku), their cover of "メリュー" (Mairieux) and "朱色の砂浜" (Shuuiro no Sunahama).

They have shown to make quite a number of videos relating to Undertale and other entertainment as of late, including speedpaints and animations.

Affiliations and Collaboration Projects

  1. Member of HOMOSlice with Leelee and Kori (Participant in Teacup Trio Battle 2014)
  2. Member of phantasmagoria▹ (as animator)
  3. Member of Smashing Diamonds (as animator)
  4. Member of Red Velvet with Rena and Seka (Participant in Teacup Trio Battle 2015)

List of Covered Songs

  1. "Pokémonshka" (Matryoshka) -Italian ver.- (2011.12.23)
  2. "Dream Meltic Halloween" -Italian ver.- feat. Envy, Thymeka, Kim, Kiro, Eimiliddel, Mark and MastaH (2012.02.06)
  3. "Happy Synthesizer" feat. Envy and MastaH (2012.02.07)
  4. "Mozaik Role" feat. Envy, Aima, Effe, Kiro, Kuuki, Jassy, MastaH and Moni (2012.03.11)# "Maji LOVE 1000%" feat. Envy, Nina, MastaH, Hicchan, Aima and Effe (2012.05.25)
  5. "Karakuri Pierrot/Pierrot" (Mechanical Pierrot) feat. Hicchan, Kim, Kiro, Kuuki, MastaH and Saiki (2012.07.16)
  6. "Senbonzakura" (A Thousand Cherry Trees) (2012.07.27)
  7. "Sky High" (2012.07.28)
  8. "Fighting for you" (Garry's theme song) (2012.08.11)
  9. "Shiryokukensa" (Eye Examination) (2012.09.03)
  10. "Shinzou Democracy" (Heart Democracy) -English ver.- (2012.09.05)
  11. "Nisoku Hokou" (Two Breaths Walking) (2012.09.07)
  12. "Tokyo Teddy Bear" (2012.09.12)
  13. "Kochira, Koufuku Anshin Iinkai desu." (This is the Happiness and Peace of Mind Committee.) (2012.09.22)
  14. "e-scape" (2012.11.12)
  15. "WAVE" (2012.11.23)
  16. "Gossip" (2012.12.04)
  17. "Dare demo Ii kara Tsukiaitai" (I Don't Care Who, Somebody Go Out With Me!) (2012.12.05)
  18. "Yi Er Fanclub" feat. kuma☆ and NiNa (2012.12.07)
  19. "Soitogeta Android e" (To My Eternal Lover, Android) (2012.12.23)
  20. "Ren'ai Yuusha" (Romantic Hero) (2013.01.11)
  21. "Gekkou Symphonia" (Moonkight Symphonia) (Aquarion EVOL ED) -TV size- feat. Envy and MastaH (2013.01.15)
  22. "Nakimushi Robot" (Crybaby Robot) (2013.01.20)
  23. "GLIDE" (2013.01.29)
  24. "Kaitou・Kubozono Chiyoko wa Zettai Misuranai" (Phantom Thief Kubozono Chiyoko Never Makes a Mistake) (2013.02.09)
  25. "Mata ne ... no Kisetsu" feat. Envy, MastaH, ehmz, Azu and Mark (2013.02.14)
  26. "Deadline Circus" feat. kuma☆, Beato and Kori (2013.02.15)
  27. "Hitorinbo Envy" (Solitary Hide and Seek Envy) (2013.03.12)
  28. "Lost One no Goukoku" (Lost One's Weeping) (2013.04.02)
  29. "Tengaku" (2013.04.08)
  30. "Gigantic O.T.N" feat. Envy and MastaH (2013.04.18)
  31. "Kagerou Days" (Heat-Haze Days) (2013.05.07)
  32. "Valentine・Kiss" feat. Envy, Skylark, Moni, MastaH, Chie, Kim, Effe and Aimei (2013.05.25)
  33. "Yobanashi Deceive" (Night Talk Deceive) (2013.07.10)
  34. "Yī Èr Fanclub" (1, 2 Fanclub) -GigaP arrange ver.- feat. Envy and MastaH (2013.07.26)
  35. "Love Song wo Korosanaide" (Don't Kill the Love Song) -Italian ver.- (2013.07.29)
  36. "Yuukei Yesterday" (Sunset Yesterday) -Italian ver.- feat. Envy and kuma☆ (2013.08.06)
  37. "SECRET DVD" (2013.08.11)
  38. "Panda Hero" feat. Aimei, Chie, Effe, Kim, Kiro, kuma☆, Moni, NiNa, Saiki and Skylark (2013.08.16)
  39. "NeapolitaN" (2013.08.21)
  40. "HYBRID" (2013.08.29)
  41. "Shinde Shimau to wa Nasakenai!" feat. Envy and MastaH (2013.09.17)
  42. "Ayano no Koufuku Riron" (Ayano's Theory of Happiness) (2013.09.24)
  43. "Kimi no Oto" (Your Voice) feat. Azu, Maeko, Malta, kuma☆, Rin, Sena, Saru, Seika, Wind, Yun, Shooter, Iyuse, Kori and Skylark (2013.12.24)
  44. "Get Jinxed" (League of Legends) (2013.12.30)
  45. "Take Your Way" feat. Ehmz, Envy, Kiro and kuma☆ (2014.01.21)
  46. "Seisou Bakuretsu Boy" feat. MastaH and Envy (2014.01.26)
  47. "I shared a kiss Sagara Yoru" (Boku wa Hatsune Miku to Kiss wo Shita) (2014.02.01)
  48. "scythe weasel" (2014.03.01)
  49. "Mousou Zei" (Delusion Tax) feat. Sarubaby and kuma☆ (2014.03.06)
  50. "Furisodeshon" (2014.04.01)
  51. "Dokusenyoku" (Mono Poisoner) -Short ver.- (2014.05.21)
  52. "glow" -Piano & Strings Arrangment- feat. Akari, Acron, Beato, kuma☆, Nico, Raku, Roze, Xandu and Yun (2014.06.01)
  53. "Yotsuya-san ni Yoroshiku" (Leave it to Yotsuya-san) feat. MiLK, MastaH, Leelee and Kori (2014.07.12)
  54. "Love Doll" (2014.07.15)
  55. "Inokori Sensei" (Detention Teacher) feat. Envy and MastaH (2014.07.15)
  56. "Unravel" -Dj-Jo Remix ver.- (2014.07.19)
  57. "Close to you" -Italian ver.- (2014.08.04)
  58. "SILENCE" feat. JSAKA, karo, Kenta, Pengu, Leelee, kuma☆, JinJin, Kura, hanami and Tuna (2014.09.19)
  59. "Dareka Umi wo" (Zankyou no Terror ED) -Italian ver.- (2014.09.26)
  60. "Rising Hope" (Mahouka Koukou no Rettousei OP) (2014.10.03)
  61. "Jishou Mushoku" (Self-Inflicted Achromatic) -Italian ver.- (2014.11.14)
  62. "Gishin'anki" (Jumping at Shadows) feat. Arianna and kuma☆ (2014.11.22)
  63. "Heimen Setsu" (Entry of Secret Santa 2014) (2014.12.21)
  64. "Oto no Naru Hou e" (The Way to Becoming A Sound) feat. Awa, Arianna, Envy, Kiro, kuma☆, Kuu, NiNa, Thymeka and Tuna (2014.12.29)
  65. "Shinkyou⇒Exclamation!" (Faith in God⇒Exclamation!) (2015.01.10)
  66. "Gekkou Junshoku Girl" (Moonlight Embellishment Girl) (2015.02.08)
  67. "Undead Enemy" (2015.03.26)
  68. "Tsukiakari" -Acoustic ver.- (2015.05.23)
  69. "Stomach Book" feat. Red Velvet (Entry of the Teacup Trio Battle 2015) (2015.06.20)
  70. "Streaming Heart" (2015.07.27)
  71. "Hello, Shooting Star" feat. Akari, Ali, Arietta, Aruvn, Candaey, Gyoza, kuma☆, Mom0ki, Rin, Sauce, Seka, Trance, Un3h and Xandu (2015.08.15)
  72. "Connecting -World Edition-" Nv.gif -ver Borders- feat. kuma☆, Chalili, Len, cheeseman, Toriko, Howl, SquaDus and Lucky (2015.08.26)
  73. "Shuiro no Sunahama" (A Sandy, Scarlet-Colored Beach) (2015.09.10)
  74. "Hibikase" (Resonate) -Italian ver.- (2015.09.19)
  75. "Meryuu" (Mairieux) (2015.10.24)
  76. "Carnival" -2013 Reupload- (2015.10.31)
  77. "Close to you" (Sans voice) -English ver.- (2015.12.01)
  78. "About Me" (2016.02.01)
  79. "Connecting -World Edition-" Nv.gif -ver. Connect- feat. Sumashu, Enae, Kiro, Hiruma, Un3h, ehmz, Tune, Paperblossom, cheeseman, SquaDus, kuma☆, Howl, Chalili, Lucky, Len, and Toriko (2016.02.12)
  80. "Super Nuko World" feat. Hikaru and kuma☆ (2016.03.06)
  81. "Akaito" (Red Thread) (2016.03.12)
  82. "Machibouke no Kanata" (Beyond Waiting In Vain) (2016.04.07)
  83. "Datsugoku" (Jailbreak) (2016.05.03)
  84. "Saezuri" (Chirp) (2016.06.01)
  85. "Love in the Ice" (TVXQ song) feat. Azusa, Bunny, Kai, Kal, Kerri, kuma☆, Lala, Mantiev, Melo, and yuyechka (2016.06.22)
  86. "Palette" feat. kuma☆ and Lea (2016.07.24)
  87. "Jiriki Hongan Revolution" (Ansatsu Kyoushitsu OP2) feat. Arietta, Aruvn, Akari, Gyoza, kuma☆, Mom0ki, Rin, Sauce, Seka, Trance, Un3h, and Xandu (2016.08.15)
  88. "Sayonara Minnasan" (Goodbye Everyone) (2016.08.19)



Kuma Gossip.png
kuma☆ as seen in "Gossip"
Illust. by Ruichimi
kuma☆ as seen in "SECRET DVD"
Illust. by Paola Amormino
Sarubaby kuma MousouZei.png
Sarubaby (left) and kuma☆ (right) as seen in "Mousou Zei"
Illust. by Sarubaby
Kuma Furisodeshon.png
kuma☆ as seen in "Furisodeshon"
Illust. by themself
HOMOSlice TTB2014-R1.png
MastaH, Leelee and Kori as seen in "Yotsuya-san ni Yoroshiku"
Illust. by Muika
Kuma Rising Hope.png
kuma☆ as seen in "Rising Hope"
Illust. by themself
Gishinanki Arianna kuma.png
Arianna (left) and kuma☆ (right) as seen in "Gishin'anki"
Illust. by themselves
Kuma tsukiakari.png
kuma☆ as seen in "Tsukiakari"
Illust. by themself
Red Velvet TTB2015-R1.png
Left to right: Seka, kuma☆ and Rena as seen in "Stomach Book"
Illust. by Mizury
kuma☆ as seen in their YT channel icon
kuma☆ as seen in their TY channel banner
kuma☆ as seen in their Facebook page


  • They prefer they/them pronouns. [2]
  • They major in Multimedial Arts at the Academy of Fine Arts in Palermo.[3]

External Links