This was interesting. Let me start by saying that the soundtrack was probably one of the bests I've heard so far and that the main story kept me curious until the very last episode. On the other hand, this anime has a lot of unrealistic stuff, which bothered me. [spoiler] That chess game in the airport was terrible, it even had illegal moves and just didn't make sense at all. None of the bombs ever killed, at least, one person. Five, a supposed foreigner, appeared out of nowhere and just started to be a real terrorist, much worse than Nine or Twelve, **under police protection** and nothing really happened to her about that. She literally put at risk the population and nobody did anything to stop her! But I think the worst part of it all was that, in the end, she didn't even want anything from Nine, she just f-cking killed herself in front of him. [/spoiler] Five was probably the worst character that I've ever seen, I hated her so much [spoiler] that I was happy when she finally died. [/spoiler] I read once, somewhere, a comment from a wise man saying "Five was also the number of episodes she wasted". And then we have Lisa, who is not likeable at all, she does not have a personality and I think that she is easily disposable, they could have done the story without her. Besides that, it was decent, the story and the little details of it were all well explained and the ending was also great.

P.S.: If you're an English speaker you're going to cringe at Five's attempts to speak English ALL THE TIME.