I seen someone say that this is an adaptation for the VN. I didn't read further but, if this OVA stayed clear of changing things from the VN, Phantom: The Animation is really boring and confusing at first. As the first episode went by, i couldn't understand what was really going on or why they even had a reason to pick the guy to wipe his memories clean and be picked as someone to be an assassin. While the OP sounds really good, it hypes you up to just be disappointed in the underwhelming 3 episodes. Hopefully while watching the full 12 episode series, iwill enjoy that more than i enjoyed this.