There are at least two artists with this name

1. Kouhei Matsunaga grew up in Osaka, Japan. He studied architecture and was listening to hardcore techno and rap music. He started to make music back in 1992 focusing on rather experimental music. Kouhei also worked with artists like Merzbow, John Watermann, Asmus Tietchens, Rudolf Eb.er, Anla Courtis, Greg Davis, Conrad Schnitzler, Lesser, Sean Booth (Autechre), Mika Vainio, Max Turner, PM (Puppetmastaz) and Sensational (ex Jungle Brothers).

For his project NHK he collaborates with Toshio Munehiro.

Today Kouhei lives in Berlin.

2. A Japanese punk/loligrind band
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Artist biography from last.fm