^ I was referring to Honda, specifically, but you remind me that I forgot to mention something.
Technically the story ended with Asami in a horrifying situation, but I'm almost certain that the mangaka wasn't planning to end it on a tragic note. The weird hypothetical scenario in the last chapter could be seen as what actually happens some time down the line, but that couldn't be included as such without explanation. And in Hatanaka's dream, Asami is very adamant that they will see each other again. She was meant to get out of there eventually. The story got cut short before it could happen and the ending is vague, but it's hopeful. I think the author tried to show that Asami would be all right with the amount of pages she had left without writing an abrupt cheesy ending.
So, no, I don't see it as a het end or a prostitution end. But I have decided to be optimistic about this one, so feel free to disagree.