[fallen11]

Most jap ktv in Taniya area do take non jap customers. especially if you are asian.
There was a time where these ktvs totally do not take non-jap customers but those days are gone more than a decade ago. Japanese nowadays are more stingy and do not spend as much as the old days. So for these joints to survive, they have to start taking in non-jap customers.
Yes the girls can speak jap. But thats not the only language they speak. Of course thai too. But quite a number of them can speak simple english. Dont expect many of them to speak chinese though.

Nothing wrong with going ktv alone. Only u have to look after yourself and not get too drunk till u cant go back to your hotel or u start to create trouble without knowing. I mostly go such places alone too. Its much better experience to enjoy alone than having a buddy who couldnt click with you.