for cams
Bongacash has japanese language versions for Bongacams
Crak Revenue is a reseller for JP Cams Exposed
Interdollars has AsianCamSex and AsianBarCams
and of course the big one, as Leroy mentioned already, DTI
for jp dating
Cupid media has
JapanCupid <-jp lang (is not much for adult though)
for paysites
Jav Bucks has japanese geo language tours, so i also recommend that one
and
Webclicks / Amakings for Jap Box