Can we get it straight that "Doujin" isnt a genre of music , and all the techno music falls into the category of J-Core/J-Trance
With that said..
ALiCES EMOTiON
HARDCORE TANO * C
Sketch up! Recordings
C.H.S - Cutie and Headshaking Sounds
Murder Channel Records
Tatsh! Music Circle
Psycho Filth Records
Druggy's Acid Rack
UOM Recordings
Sharpnelsound
MOB SQUAD TOKYO BLACK LABEL
Notebook Records
Salvation By Faith
Xtreme Hard
999 Recordings
IOSYS
SOLIDBOX RECORDS
boostisizEd Euphoria
Dynasty Records
Speedking Productions
Sampling masters
KINZOK.ON
MPT
SHOT BASS IDIOTS
Those are SOME of my favorite Circles/Labels . I spend a lot of time/money looking for this music .