Angels lived among us before they chose to join the ranks of H.E.A.V.E.N. to prevent demons from ruining human kind, and most still do. In this world that is unaware of the creatures it bears, one group of angels shine upon all, but what will happen when they meet the one demon that soothes their hearts? Will they surrender to her beauty and her desperate cry for help? Or will they carry out their mission like they are expected to?