Re: https://www.last.fm/music/paraoka, https://ja.wikipedia.org/wiki/Paraoka, https://en.wikipedia.org/wiki/Vocaloid
Paraoka (ぱらおか) is a Japanese doujin music artist and composer. He has been active since the early days as a composer of BMS music. He also composed the full soundtrack to "psycho-function" in 2004. He has collaborated with several doujin music circles, such as Diverse System, and his works are also often used in StepMania mixes, most of which can be found available on his personal website, curse-words.com.
He has also collaborated with female vocalist Haru*nya on several of his albums - Haru*nya and Paraoka have also collaborated with and are part of the group Kojimachi-onsen (麹町音源 / 麹町養蚕館).