I picked up the first DVD of this series without knowing anything about the original manga or the creator. The first half of this series is really impressive, however (I have yet to locate the second volume). The characters are deep and interesting and leaves one wishing that the producers had made this into a full-length series instead of a four-episode OVA. The plot, revolving around a 15 year old kid finding himself in the middle of a massive demonic conflict over the future of Earth, is cool and really keeps one's attention. Stick with the Japanese soundtrack with English subtitles, because the voice casting for the English soundtrack is rather mediocre at times. A word of warning about content, however. This isn't anime for kids. The violence isn't overly graphic (not up to the gory standard of the likes of Akira) but there is plentiful female nudity, especially in the first episode. I highly recommend this anime fans and anyone with a taste for the supernatural.