I assume by AVN you are referring to sexually themed visual novels. If so, you're correct, this game is not one of those. You can check the description or my latest 'Important' post for more information.
Please refrain from misleading others by claiming that this game does not have choices or paths—it's not a very nice thing to do.
As for why you found this game under 'Adults,' the only reason I can logically assume is that when posting my game, I checked the sensitive content box, which, to my understanding, doesn't solely refer to sexual content.
In any case, I can see that my game didn't meet your expectations, which is understandable. The only thing I can do is wish you a good day and good luck finding a game that better suits your tastes.