Cologne in the 13th century: during the construction work of the "Dom" master-builder Gerhard agrees to a pact with the devil, who conjures up countless demons.
Arduously the people push back the monsters in an arritional fight into a mysterious book-the Daimonion.
About 700 years later a young girl errs through streets which are bombed due the war.
Hints about her father allure her into the arch of the Dom, where she finds the Daimonion.
When she opened it, she arouse the creatures, which were defeat by the humans since long ago, they thought...

(translated from Tokyopop Deutschland)