Watashi no Messiah-sama

Story
In the manga series the Archangel Selakiel, who became the god of Celestia, created human beings. But just as Shadow is born from Light, Evil is born from Good. Thus, at the same time, a large number of demons were born into this world.

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And then, the 13 Knights led by Vaul the Prophet appeared...at the end of a battle which cost the lives of many of their own. The 13 Knights sealed away the demons and saved Celestia, or so it should have been. Now a thousand years later, the demons have reappeared...and this time, the Messiah has been called to save Celestia.