IOSYS is a Japanese musical ensemble and doujin circle from Sapporo, Japan. The group is primarily known for producing rearrangements of music from the Touhou Project series of shoot 'em up video games.
They are not signed to a label, instead preferring to release their music through dōjin channels such as the Comiket convention and via their website. Their music frequently parodies characters or themes of games such as those of the Touhou Project or Atlus's Etrian Odyssey.
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