I had tried to watch the show while it was being simulcast, but never got past episode 3. I just got bored with it. After listening to a rather glowing review on an anime podcast, I decided to try it again. I am glad I did. I ended up doing a marathon watching of the rest of the 25 episodes. Watching the show is incredibly suspenseful because the show is one big mystery that keeps you hooked till the end. Throw in some likeable characters who aren't afraid to actually make decisions, some interesting time-skips, a mysterious world built around a tightly controlled dystopia where everyone is psychokinetic, mutant animals, missing children, acceptance of same sex pairings among adolescents, a true atmosphere of dread and horror, and a satisfactory conclusion, and you have a winner. I think this type of show benefits from a marathon style watching because each episode usually ends on a cliffhanger and the maintenance of the tension is easier when shows are watched back to back. This is based on a single novel which helps it avoid the open ended ending trap with a lot of anime. There is a true feeling of horror sometimes which I rarely feel with anime. It's a great drama/horror/mystery.