To be honest, I'm not really sure what went wrong with this manga. I saw the OVA (which, despite others' criticisms, I think is beautifully done) and I was fascinated enough to want to read the manga.
Like everyone else on here has said, the manga is very confusing. It's like there are pages missing. However, I'm pretty sure that this isn't entirely the mangaka's fault. I mean, I've never heard of a manga being that terribly written where literally nothing makes sense. Especially not a manga that got made into an anime or was allowed to fun for three volumes.
So no matter how hard it is to scanlate these things...I have to rest the blame on the scanlations. Hopefully my Japanese will be good enough to read the original one day...
So a bit about the OVA and why it's such a shame that we can't get a decent version of this manga to read (I can't even find the original Japanese version anywhere...>,>).
First of all, it's not really supposed to have anything to do with the manga at all. Minus the very opening scene which is a flashback to when Matsui and Yuuji were kids (or...er...younger in Yuuji's case), the OVA doesn't cover any of the material in the manga. It's supposed to be a prequel, which is why some people may think it skips around too much; that's because it's setting up all of the conflicts which are brought to a head in the manga (such as Karakawa and Yuuji's conflict, Yuuji's anxieties, Matsui's depression, Yoshino's obsession). Not only are the character really well explored for a one episode OVA, but the animation is really well done with (I'm sorry, but hilarious) 90's J-pop giving the scenes a nice and somewhat surreal tone. It's honestly a bit trippy in some places, but I thought that was interesting in how it helped to develop the characters.
So I liked the OVA and wish that I could read more of the manga. I've re-read it many times and I still can't make too much of it. >,> It does seem like a lot is going on, however. I don't recommend it to people who aren't willing to work to understand it until we have more answers as to what really is happening...