This is the second time it happened. Once in a while I would see an ad for a different game, and a Koban reward to try it out. After trying it out. I got no Kobans as promised. First time was with that VR 3d sex game. Sexvilla, if i'm not mistaken. It required you to register and play. I registered, downloaded, and played. Nothing.
Now another one pops up, with the requirement to only register on this site for interactive porn. I clicked the link. Registered, and even tried it out. Still nothing.
If I'm not mistaken it was promised 600 kobans for both (Total of 1200 Kobans). Got nothing out of the two after doing the requirements.
Edit: I've already sent an e-mail about 2 weeks ago with still no reply.