Togethernetworks has 3 dating offers with japan localization
Loveaholics – 1.5$ SOI and 2.5$ DOI
BeNaughty – 1.5$ SOI and 2.5$ DOI
Flirt – 1.5$ SOI and 2.5$ DOI
Bongacash - webcam netwotk - works with Japan and gives all japan localization promo. You can choose needed language promo in admin-panel.