[=cosMo=], also called Bousou-P after one of his more popular works, is an animator and prominent {{Vocaloid}} composer. He has become famous in the {{Vocaloid}} community for producing a vast number of extremely fast-tempo songs (often over 200 bpm), pushing the software to its limits. He has composed music sung by Hatsune Miku, Kagamine Rin and Len, Megurine Luka, Gumi, and Gakupo; while most of [=cosMo=]'s works are Miku songs, he claims that his favorite Vocaloid is Kagamine Len.

He does a number of his illustrations himself, and also has personally covered a number of Vocaloid songs. [=cosMo=] is said to have an unusually "cute" voice for a male singer. ([[http://www41.atwiki.jp/niconico_singer/pages/390.html Judge for yourself]].) He has recently released a Vocaloid cover CD called "What Do You Mean ''You're'' Gonna Sing?!!", in which he covers a number of his own works.

[=cosMo=] has produced two series--the ''Fantastic Garden'' series, and ''The Disappearance of Hatsune Miku,'' which is responsible for his leap to fame. He has produced a number of mini-albums, and his songs are often included in Miku compilation [=CDs=]. ''Fantastic Garden'' is known for being extremely surrealist, and ''The Disappearance of Hatsune Miku'' chronicles the experience of what life is like for an actual Vocaloid program with a merciless eye. The ''Disappearance'' series, along with a few new songs, has been released as a full-length CD which will also be [=cosMo=]'s major debut.

In addition to Vocaloid songs, [=cosMo=] also produces songs for the doujinshi-centric ''VideoGame/SoundVoltex'' series, and has made a few remixes of Music/{{BEMANI}} songs.

!The ''Disappearance'' series includes:
* New World
* 0 -Zero- (The Birth of Hatsune Miku)
* [[IAmSong Let's Play with Hatsune Miku!]]
* [[WhatIsThisFeeling A.I.]]
* The Rampage of Hatsune Miku
* The Confusion of Hatsune Miku
* [[BSODSong The Division-->Crash of Hatsune Miku]]
* Bye-Bye World of Common Sense
* The Demise of Hatsune Miku
* The Disappearance of Hatsune Miku
* Hyperinflation
* ∞ (The Resurrection of Hatsune Miku)
* [[EarnYourHappyEnding The Intense Song of Hatsune Miku]]
* Yellowbrick Milestone

!The ''Fantastic Garden'' series includes:

* The Girl's Fantastic Garden
* Miku, Piano, and Fantasy
* Magical Girl Radical Paint
* Anti-The Fantastic Garden
* Miyako Wasure
* Capsule
* ANTI THE ∞HOLIC
* At the Old Capital of Atriesta

!The ''Star Girl and the Illusion Paradise'' series includes:

* Solitary Confinement, Stellar Theater (Luka; not an official part of the series, but was Stella's debut as a character)
* The Star Girl and the Illusion Paradise (Luka)
* [[http://www.youtube.com/watch?v=Ov8W-5r1po0&feature=related The Runaway Boy and The Lost Girl]] (Gumi)
* [[http://www.youtube.com/watch?v=UjQkKf9DpTo The Nun and the Idol Girl]] (Miku)
* [[http://www.youtube.com/watch?v=hzIQ7fGin9s&feature=relmfu The Childish Girl and the Grown-Up World]] (Gumi)
* Our Cosmology
* [[http://www.youtube.com/watch?v=vwFFrHJFheY&feature=related Dr. Realist]] (Gakupo)
* [[http://www.youtube.com/watch?v=d4jb8OfgV0o&feature=channel&list=UL The Adventurous Girl and The Miniature Garden Game]] (Miku)
* [[http://www.youtube.com/watch?v=3LHuE08NzDk&feature=related The Radio Girl and the Fantastic Garden]] (Miku)
* [[http://www.youtube.com/watch?v=7AblJsys3m4&feature=related The Reincarnated Girl and The Reincarnated Boy]] (Rin and Len)
* The A.I. Girl and her Deep-Sea Heart (Everyone)
* Lavender End Roll
* [[http://www.youtube.com/watch?v=-cyR_pR4_j0&feature=related Another Lost Girl]] (Extra)

!Other songs, remixes and covers:

* Song Box (one version each for Miku, the Kagamines, and Luka)
* Dennoh Skill
* Packaged (cover)
* Meltdown -Hard RK Mix- (cover)
* Just Be Friends -Hard RK Mix- (cover)
* R-18
** R-25 (self-cover)
* Dokubou Stellar Theater
* Magical Kitty Len Len
* Dystopia Jipangu
* Rainbow Adventure NTG Remake (cover)
* The Rampage of Kagamine Len (a spoof of "The Rampage of Hatsune Miku")
* Melt -Soft LM Mix- (cover)
* [[VideoGame/SoundVoltexBooth Evans VolteX Pf arrange]] (remix)
* [[VideoGame/SoundVoltexBooth neu BSP style]] (remix)
* Escape from Dystopia
* Sadistic.Music∞Factory

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!!Tropes utilized in [=cosMo=]'s songs:

* AGodAmI: Miku in ''Disappearance''.
* AlternateCharacterReading: ''Anti The Fantastic Garden'' is spelled with the kanji for "The Girl's Fantastic Garden" in reverse. Often abused in ''Disappearance'' songs' lyrics.
* AntiVillain: Dr. Realist, Type IV, in his own song, as he simply aims to free the inhabitants of the Illusionary Theater from Fantasy to Reality. The results are ... one trip short into disaster.
* AnachronicOrder: On the ''Disappearance'' CD, ''Zero'' is track 8, and is presented as Miku remembering her own first startup.
* AxCrazy: The resurrected virus!Miku.
** LaughingMad
* BSODSong: You could say that this is a specialty of his...
* BodyHorror: The creation of Append is described as some unholy mix of rape and vivisection.
* {{Bokukko}}: Miku. The ''Disappearance'' series explains that [[spoiler:this is the pronoun of choice for all Vocaloids because "boku" is a homonym for the abbreviation VOC. in Japanese]].
* ButtMonkey: Len.
* CameBackWrong: Miku in ''Hyper∞lation'' [[DamagedSoul isn't quite the same anymore...]]
* CanonWelding: In one of the bad endings Miku imagines to ''Disappearance'', she winds up in the Fantastic Garden. The writer in ''Fantastic Garden,'' who originally had a cameo in ''Runaway Boy,'' turns out to be another real resident of Stella. Stella herself was the singer of a one-shot song, but then popped up again in the Star Girl series as one of the masterminds behind it.
* ChekhovsGunman: The protagonist of ''The Reincarnated Girl and the Reincarnated Boy'' shows up again in ''The A.I. Girl and her Deep-Sea Heart'', where she is not only revealed to be [[spoiler:the same person as Rho]], but also ends up [[spoiler:liberating Stella and everyone who was stuck in her town, succeeding where Dr. Realist always failed]].
* ConceptAlbum
* DeathByCameo: Runaway Boy and the Lost Girl features short cameos by the Fantastic Garden writer, Rin and Len from Atriesta, the girl from R-18, and Lucy(A.K.A Shii-tan,the little girl from Capsule). Lucy is sitting on top of a skyscraper. She's so enamored by her drug-induced hallucinations that she falls off.
* DownerEnding: Doesn't the last few seconds of ''The Adventurer Girl and the Playground of Eden'' sound familiar? [[spoiler: That's right. It's her own electro-cardiogram.]]
** TheEndOrIsIt: [[spoiler: It could as well be that it was removed, which means she got out of the hospital. But we all know cosMo does not like like Happy Endings like that.]]
** Nope. In ''The AI Girl and Her Deep-Sea Heart'', Miku sings about not being able to think while dying while an image of the character lying still in the hospital gown she wore at the end of the PV appears on screen. So, it's fairly safe to say she didn't live.
* DrivenToSuicide: The end of a number of ''Star Girl'' songs.
* EarnYourHappyEnding
* FinalBoss:
** ''The Disappearance of Hatsune Miku'' in several of the ''VideoGame/HatsuneMikuProjectDIVA'' games.
** ''For [=UltraPlayers=]'' was one of the final round songs in the ''Sound Voltex II'' section of Konami Arcade Championship 2013. Furthermore, while the series' difficulty to that point peaked at level 15, it was one of the first two songs to have a chart rated a '''16'''.
* {{Gayngst}}: The protagonist of ''Reincarnated Girl''.
* IllGirl: Adventurous Girl.
* IWantMyBelovedToBeHappy: "Reincarnated Girl/Boy" towards "Lost Girl".
* LastNoteNightmare: ''Demise'' and ''Runaway Boy and the Lost Girl''.
* LuckyCharmsTitle: Hyper∞lation, Capsule, Sadistic.Music∞Factory.
* MindScrew: Fans are already whacking their brains out which came first: ''Radio Girl and the Fantastic Garden'', or the Fantastic Garden series. Or that either are just very coincidentally the same. Or that it's a result of [[CanonWelding cosMo simply wanting to]] screw with us.
* MissionControl: Luka in ''Rainbow Adventure NTG Remake''.
* MotorMouth
* MultipleEndings: ''Demise'' is the "Worst End", ''Disappearance'' is the "Dead End" (and ''Hyper∞lation'' is its sequel), ''∞'' is the "True End", and ''Intense Song'' is the "INFiNTY Happy End".
* RefugeInAudacity: Capsule is about an entire kingdom that's falling into ruin because all the adults spend their days in a drugged haze, from the perspective of a little girl who only manages to find happiness by [[MushroomSamba joining them in the pill-popping action]]. There aren't many media where you can get away with stories like this, let alone have them become popular.
* TakeThat: ''Dr. Realist'', meet Radio Girl.
* TakeThatMe: Both Miku and Len's Bousou songs have them addressing [=cosMo=] as something of a pervert with delusions of grandeur (Len even asks straight-out if he thought he was buying an eroge when he bought them!). The lines of nonsense kanji that Miku screams in Hyper∞lation could also be lampooning how little sense all those high-speed lyrics tend to make.
* {{Tsundere}}: Rin.
* VillainSong: ''Dr. Realist''

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