a story of people who's lives have always been intertwined

there's a LOT going on in this story, but mostly it's a fantasy mystery

Just like earth, except guardian angels are all throughout the world, hiding and always caring and watching over. Some angels show themselves, and their humans pay the price first. This happens with an angel who had named himself Blue. His choice to go against heaven sets things in motion.

Angels/demons can transport themselves almost instantaneously (never more than 5 seconds, but depends on how far away they are from their target location; if they have a human with them it's an additional few seconds, this varies in the amount of people with them) whilst connected to heaven/hell

connected- mentally + physically connected to heaven/hell

demons/hell-
connected: can travel almost instantaneously, bat-like wings, ability to change appearance/form to anything at will (see notes about color), the only thing they're ahead of heaven with is a sort of telepathic intercom system they all have in their heads, can also communicate with loaned pins that function as microphones and speakers, they have the ability to destroy/burn things or people (demons vary in power level)
not connected or the synfull: has to travel like humans, usually have torn up or burned wings so they can't fly (some sneak out with only a few cuts; see notes about demon wings), cut off from all communication between other demons, everything they have disappears as soon as they leave hell

angels/heaven-
connected: can travel almost instantaneously, large majestic bird-like wings, can change appearance at will, but there are limits (cannot change into anything that is evil or impure, see color in notes), have a messenger system in heaven, and on earth if something is urgent it's sent by golden eagles, but it's normally the same method used in heaven, angels have the ability to create things or "bring them forth" and also have special abilities that vary from angel to angel (it determines what your job is if you're a lowly angel, and if you're a more powerful angel, such as an archangel, you can have up to three abilities and they vary in power)
not connected: not many aren't connected, and they ones who are ran or fell away from heaven. heaven, upon catching them, pretty much just sends them to hell for however long is 'necessary' (see notes for details). necessary is usually eternity if they can't escape, but demons and angels are enemies, demons don't let angels out.

color of things demons can turn into: only in dark/washed out colors, never a vibrant or light color: drained earthy tones, gray scale, washed out reds/oranges/pinks, mostly dark blue-grays and black

color of things demons can turn into: only in light/vibrant colors, never a dark or washed out color: pastel tones, rainbow, multicolored, vibrant, mostly pure whites and golds

demon wings: when they get out of hell or are cut off from the connection, they are given a unique scarring on their wings and/or bodies that follows them in whatever body they possess (their wings come with them when they possess someone) and they can range from completely cut off to a couple slits in the skin

heaven's way of disconnecting: leads to mangled, clipped, or removed wings - various scars: burns, cuts, removing and stitching back together of limbs, inflation of the bones/muscles/skin, yeah, you get it, it's hell