It's a full on thriller that keeps you on the edge of your seat begging for more of the story but avast ends in only the few episodes.
Which is the issue with the characters not being fully developed and not understanding the reasons why the characters act each way, you do learn some back story, but it's not enough to learn more on their motives and personality.
I highly reccomend this for any anime fans who like thrillers, horror/psychological and drama. It will be a anime you probably will never forget about. Finally, there is a light novel for this so check it out as there is way more to the story.
