I've finished Nanase, Mayu and Mio routes (probably Akane as well, I think). But that's exactly the problem, maybe it's just me, but every route I've played through felt like it got cut short, and I still don't get the fantasy stuff that's going on at all.
Now, I certainly enjoyed the game very much, but most of it was common route and from all the routes I've played there certainly wasn't anything I'd consider a proper ending, with the protagonist disappearing act and all.
At this point in time, I don't even mind spoilers, but I would like to understand if I'm missing something here, or if that's all the routes provide.