I might be a bit biased as this is one of my favorite mangas or even my favourite one. I wonder why this is so underrated. I wish studio pierrot put a bit more of money in its production... on the voice actors and ... well. I guess we will never get a second season as this was a loss making project for them. But believe me the story is very cool. Its a break from the everyday shonen (and seinen?). Definitely worth a try. Go my boy Shin.