I like the Zero no Tsukaima novels, but the anime is a complete dumpster fire of an adaptation that cuts pretty much all the plot and characterization.
Same thing goes for Rosario + Vampire. The manga's an ok enough battle harem series, but the anime basically cut all the plot and action scenes.
and yeah, Boogiepop Phantom is an anime original sequel arc to the first novel in the series, Boogiepop and Others (I guess because the live action movie adaptation of the novel was successful) while the new Boogiepop and Others series is an adaptation of the first few novels. Most of Phantom is episodic stories about new characters.
The only certain death in the universe is Mother Hitton's Littul Kittons.
Not changing this line until I beat Seven Heroes (2/24/07) - Fulfilled 2/20/18