It took so long to get to the point; it was overly drawn out. I kept groaning my way through the silly episodes because the plot developed ever so slowly. It was silly forever, and then the plot jumped off the cliff into the darkness.
The characters were a little confusing, but probably the best part of the anime. A part of me loved the strange yaoi dystopia where women don't exist. There wasn't a lot of development though, it took too long to even get to know the characters.
The dissociative counterparts were a bit unrealistic, but heaps better than a lot of media about DID. It bothered me how different the voices and looks of the counterparts were though. Ran's voice made me die inside a bit every time he popped out. That alone made my give such an awful rating for sound... I guess this anime is 13 years old now, but the art was pretty bad. Early 2000's weren't exactly good years for anime, but still. Many others released around the 2005 era weren't so bad about art and sound.
Overall a good idea I guess? But poorly executed.
