Ya theres only six episodes, and everything makes sense but in the same way it doesn't... its really hard to explain but you have to figure out the meaning for yourself. Watch it a couple more times and you should be able to figure it out for yourself. But basically its a coming of age story.
Yeah, I know that it's about coming of age, but the story is pretty screwed up if you ask me... I find it kind of random that a robot will burst out of someone's head if you give them a blow to the forehead with a bass guitar.
But thats what made it so great for me, well that and the music. But their Japanese, so they can be as strange as they want. Btw just throwing it out there that my favorite episode was the fourth.