While some people say it's very thin in terms of giving you a backstory but I feel that it's part of the show, that you get given glimpses of the past (similar to some of the side characters). It's true though that the first few episodes are really just down to guesswork, but as the show progresses the puzzles and clues start to up their game. The soundtrack is very nice along with the art, the ending credits feature a song from the re-formation of the band Supercar, the song being incredibly fitting towards the rest of the show.
It must be said, however, that this anime's biggest flaw is that it feels incomplete; the plot of the past is missing, even after finishing the show. Again though, this is more of a 'human' issue than a 'critic' issue in that the problem is how short it is, thus leaving you with a desire for more.
