- Real name: Unknown
- Website: http://www.ni-21.com/
- Twitter: https://twitter.com/djni21
- Soundcloud: https://soundcloud.com/djni21
ni-21 is a Japanese DJ and event organizer who lives in Tokyo. He has started his career as a DJ in 2000, and then starting producing music in 2010. ni-21 mainly produces tech-dance, with a shift to HDM (Hard Dance Music) from 2015 onward. He regularly plays live for the TOKYO HARD GROOVE SESSION events and always appears on doujin label exbit trax's compilations.
- ni-21 is pronounced as "nee nee".
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- MACHINES EP (2011)
- FUTURE METAL (2011)
- SLEEPWALKER (2012)
- RAVEY DAYS (2012)
- DISCO BEAT (2012)
- ENFORCER EP (2015)