Maybe the anime is more of an introduction into the story, which is why I feel like the plot was too weak and lacking; it could have been more interesting. While watching, I thought Dalian and her other self who's inside the archives are like Alice and the Will of the Abyss in Pandora Hearts; and like Oz, Huey wants to save the other Dalian in the archives. Also, similar to Cardcaptor Sakura's magician and familiars combination, there are others like Huey and Dalian, a keykeeper and its archive, whose goals differ from one another.