NATSUMEN describe themselves as a "Japanese Progressive HardCore JAZZ Aggressive Improvisation ROCK band". They're an instrumental band that were created, in 2002, after the demise of BOaT, another awesome band featuring AxSxE and Ain.
These are photos from concerts where Natsumen played, so they may be of other bands that played the concert as well.
Summer Sonic 2005 Aug 13 - 14, 2005 Tokyo, Tokyo, Japan Uploaded by Tokyo Fox