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IOSYS is a Japanese doujin circle who are best known for their remixes of music from the Touhou Project series of "bullet curtain" shooters. Many of their songs have become popular due to their accompanying animated music videos.


IOSYS was formed in 1998 in the city of Sapporo, Japan.[1] Their website was launched in 2001.[2] In 2006, they released their album Phantasmagoria Mystical Expectation which was also their first foray into the world of Touhou remixes. To promote the release of this album, their first Touhou-related music video was released featuring the song's titular track.[3] Over the years, the group created channels on various websites, including Nico Nico Douga, YouTube, Twitter, Facebook, and SoundCloud.[4][5][6][7][8]

Notable Works

Marisa Stole the Precious Thing (2006)

"Marisa Stole the Precious Thing" is a remix of Alice Margatroid's theme, "Doll Judgement – The Girl Who Played With People's Shapes" from the seventh Touhou game, Perfect Cherry Blossom. The song and it's accompanying video became a hit on early Nico Nico Douga, and has been used in many mashups and MADs.

Overdrive (2006)

"Stops at the affected area and immediately dissolves ~ Lunatic Udongein", better known as "Overdrive", is a remix of the song “Lunatic Eyes ~ Invisible Full Moon” from the Touhou game Imperishable Night. The song is known for popularizing the "Easy Modo" meme in the Touhou fandom.

F O E! (2007)

"F O E!" is a remix of the song "A Sudden Gust of Wind Before Your Eyes" from the soundtrack to the role-playing game Etrian Odyssey. The song, exaggerating the already difficult enemies due to them appearing at the worst possible times, became popular enough to influence fan's perception of the enemies, and, due to the group's strong Touhou affiliation, the enemies began to appear in fanworks of that series, despite the lack of a connection of the two.

Usatei (2007)

"Usatei" is a remix of the Stage 5 theme from the Touhou game Imperishable Night and the character Tewi Inaba's theme from the same game.

Cirno's Perfect Math Class (2008)

"Cirno's Perfect Math Class" is a remix of the Touhou character Cirno's theme "Beloved Tomboyish Girl". The song is IOSYS' most famous work, with over 6 million views on both YouTube and Nico Nico Douga.[9][10] The song also became a popular choice to dance to.

Okuu’s Nuclear Fusion Dojo (2009)

""Okuu's Nuclear Fusion Dojo"" is a remix of "Nuclear Fision" from the 11th Touhou game Subterranean Animism. The song contains many references to memes.

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