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Patton is an angel stationed on Earth, designated to keep an eye on the "other side" , aka a demon named Deceit.
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Deceit is a demon who was sent to Earth to, in the beginning, "create some chaos". Now he "keeps an eye" on an angel named Patton.
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6000 years after meeting, the world is coming to an end. Soon. And while the angels and demons may be delighted to settle a age long score, Patton and Deceit aren't to keen on letting go of their lives on Earth (together).
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Mainly Moceit but there is some analogical side plot .
If you can't tell this is a Good Omens/ sanders sides crossover
I don't own either. Good omens is owned by Neil Gaiman and Terry Prachett. Sanders sides is owned by Thomas Sanders.
I recommend watching both.