Following the end of World War II the secretive Longinus Dreizehn Orden disappeared without a trace following the completion of a grand ritual. Now in the modern day they have returned to usher in the world’s end and have focused their attention on Ren Fujii, a seemingly ordinary student with a connection to the magician who set everything in motion.
An action-drama with a significant amount of comic relief alongside a few ecchi harem aspects.
More Information:
aniDB (1, 2)
Crunchyroll
Wikipedia
But, the *real* question is did the series feature any vampires, zombies, idols, lolis, or combinations thereof?