It's always sad when we don't get the first part of a story, especially one as great as this. Still worthy of a place in the favorites even so, though.
This seems to be the second part of the story. Question is: Is the first part hidden somewhere in the backlog of fakku or was it released in a magazine that wasn't licensed at that time and thus is lost forever?
Just to let everyone know, there's no real backlog to speak of for both Shitsurakuten and BEAST. At most there are some chapters from last month's issue that haven't been released, but that's typically because they're waiting to be published and not because they're not done.
As already mentioned, the prequel predates the subscription service on a whole, and the first Shitsurakuten issue by a year.
...Well, I guess it's called priorities. Either you go to work, or you make the girl happy, and I'm glad he made the right choice.
Great ending, though. Looks like all parties agree that it's a great place to...spend time together. Also, I think a Vanilla tag would be fitting.