I never know the direction this manga is going to take. For a while I thought, towards the end of this rollercoaster we will have our main character doing out with the person they love, friendships will be recovered, and they will be set off to a new adventure.
The picture slowly turned into, maybe they will be the odd couple that makes it out against all odds. I even thought that maybe, Nazuka will be the first one to actually turn human, and she would be able to attend to the zoo during the day (I don't know if you guys remember it, but early on they went to the zoo and Kou realised it was a bad idea, given she doesn't really have an idea of what it looks like during the day, and the fact they might not be able to get that experience ever whilst she is a vampire).
Now I think the ending will be one of the saddest things I will read.
Either Nazuka dies, leaving Kou half broken with Akira coming back to help him out of the slum. Or Kou forgets everyone he was relatively close with (including Nazuna), leaving everything behind... or both of them end up dead and the person narrating this story has been Akira all along.