Just finished this. And for all the comic relief and creepiness, there was air of depression hovering over the whole show, which basically said "this cannot last forever." However, the ending was more of a "positive" and gave "hope" that this could actually last a lot longer than expected. It seemed to me like her heart beat, and then she went in for that bloody kiss...I'm gonna go ahead and say that she can prolong her existence by actually drinking blood and eating flesh.