The premise sounded good (apparently the manga is way better, but I'm not here to talk about that) but in the end, there wasn't much of an overall plot, most of the episodes seem to be the stand-alone type episodes without having much to do with things in the end. Dark needs to steal something, Daisuke and Dark have conflicting feelings of love involving the twins, sometimes Krad shows up; pretty much the same thing in each episode.
This doesn't stop there from being deep, touching episodes though. A few are actually really good but I just wish there had been more of a connection between each episode. I actually got a little lost towards the end when they had a few episodes actually working together because I wasn't really expecting it.
The last two episodes are pretty good too (probably the best in the series) but, as a whole, the series could have been better if they had put things together to tell a bigger story connecting the events of each episode.