Some sort of intelligent undead monster, at the very least. As PsyFarrow said, a revenant would almost make sense, but I don't think this series is going to get too deep into the weeds about undead nomenclature (though I would be very happy to be proven wrong on this point, mind you), so it's not something we should worry about.The Princess is a zombie?
Or the power of love/lust keeps the Princess from dying.
If that's actually the cause, that would be the second time I've seen that as the reason. Which is exceptionally weird.Her lust turned her into an undead.
The power of horny is boundless.
Yes, because the Prince's the one who's gonna be dead.Wait, so then the title of this manga is wrong...