First off, the story is awful and had some of the worst plot I ever saw. It basically follows one guy perving on his younger sister and then angels trying to destroy the earth since the demons are ironically the good guys.
It pretty much goes like this:
Boy: I wanna bone my sister!!
Sister: I'm pointless!
Demons: AH, ANGELS!! OMGWTF!
The art was terrible--it looked like every character tripped and fell into Liberace's closet because their colour coordination in their clothes and hair was totally unfabulous.
The characters are stupid. Literally stupid. They have no other drive than to serve as boring plot devices to shake and not stir up forced controversy. I cannot enjoy an anime for being so ridiculous.
What a pile of trash--I would rather be locked in a toilet that can't flush than watch this ever again.
