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Aria, at the age of nine, witnessed her own parents' death at church at the hands of an escaped maniac, claiming to be 'God's messenger'. He killed everyone there, stating where they would all go, Heaven or Hell, one by one. Aria fainted at the sight, and woke with only a recollection of it in the same church she had fainted in. Upon waking, she saw angels fluttering about, and devoted her life to listening to them, killing whomever the Lord could want.
But there were never any angels there.