I feel like saying something stupid...like: A japanese.
Seriously i have yet to find that answer. I wanted to try DTI but their promo items are very slim and somehow i am not at ease with the way the site works. I tried Noshavecash or something like that, but after 2 months i couldn't login anymore...
So, you know what i did...i made a byot (Indecent Asian Kawaii) at ARS for this reason, and i got some results with it:
http://www.passionlust.com/mainbyot/byottour.htm
Currently i have bukkake.hm for japanese bukkake, and Silvercash Kunt FU seems ok too...
But i am still searching for a japanese sponsor with at least 4-5 sites to promote, with sufficient promo items with fair prices, etc...