No, it's not a dating sim, but it also has no "true story". It's a evening with a group of people. Make the most out of it.
There are 8(?) girls in there, each one with their own short story line.
This is like an old style adventure with multiple routes. Some exclude others. Sometimes you have to decide who to give the alcohol too for example. And at one point you can play a evil trick on one girl or you decide to help her instead and trick someone else. And yes, you can also get stuck, if you use consumable items in the wrong place. But even if you do, there are enough other things to do.
Well ... if you get Vickie Vixen to join the party (first you need to find out how to), she will guide you to get into most girls pants, so that could be considered to be the "true story".