I think they really wanted to see how far they could push the limits of fan-service for teenagers (though it is rated R 18+) and the only way they could was using an idea that on its own couldn't be used for a series. I wish they had cut the fake porn and fluff and have made an interesting film instead that talked about a very serious issue.
So the story is centred around one boy who has these multiple personalities that take over when the main guy disappears to an alternative world to hide from his problems. Which is really interesting and focused upon in the last couple of episodes (but not the final, that is just a horror show that has nothing to do with the main plot and is determined to be as pornographic as possible with girls soaping each other up in a hot springs).
Mental health is barely addressed properly and that is a pity because that was the best part of the show.
The scary thing for me was that I started to like some of the characters and wanted to see them happy (but mostly I wanted to see them clothed).
There was a line they say when (finally) a bit if the plot is revealed: "Thanks for sticking it out for this long and not going to the internet or giving up." I replied to the little man inside the television, "that's because I paid for this DVD and not for any other reason. I like part of it (the main plot essentially) but was confused for most of the start and disgusted (which is bad for me since I tend to have a very dirty, I mean sexy, mind) by the fan-service. So I'm torn between recommending it or telling everyone to avoid... I guess if you have the time and the stomach give it a watch.