The graphic on the 'gate' or front page of your site is absolutely humongous. This isn't that much of a big deal, but having to scroll down, and having the bottom scroll bar pop up, are both distracting and just a little bit annoying. Personally I don't see the need for a front page like that, the graphic itself is interesting enough, but the more buttons you make your potential readers click to get to the good stuff the fewer readers you'll actually end up with.
Dark gray text on a black background can also cause problems, especially if your installments are going to run to the long end, causing reader eyestrain. Yet another little annoyance, but little annoyances can pile up, and up, and up, and on the internet there's nothing to keep someone from just clicking off your site and going somewhere else.
At the top I think it would help if you visually separated the links to segments that have and have not been posted yet, do the buttons in different colors, or fade them, or something, and I would also say that you probably want to make sure that there's a link back to your main page up at the top where people can easily see it, on every page.
And, because my momma taught me not to comment unless I had something nice to add: I really do like your graphics, they fit the moodiness and theme, and the premise for your story sounds really intriguing.