Demons and Angels

What happens when two "seventeen" and "sixteen" year old demons came up to Earth and posed as students? Lots and lots of fun of course!
What happens when two "seventeen" and "sixteen" year old archangels came down to Earth to find and "watch over" demons? Lots and lots of trouble of course!
Waterfall Academy, the place where Lilith Kaji, the Alpha, and Belladonna Himura, the Beta, the two demons, attend. On their Junior Year First Day of School, came the two archangels: Jay Amachi, the Alpha, and Artemis Hayashi, the Beta.
What happens when Artemis and Jay finds out who Lilith, the Empress of the school, and Belladonna, the Queen of the school, really are?
A high speed chase ensued, followed by hundreds of deaths.
Especially when the demons are coming of age and grow immense powers.
How will God from Heaven react? What will Satan and Devil from Hell do?
Welcome, to the history of the Great Sky War.