After Loki supposedly gave up his life to save Thor from Thanos, the God of Mischief transported himself somewhere where he could escape Thanos's wrath. Ending up back on Earth, Loki realizes he is still mortally wounded from his bought with Thanos, and he is not healing like he should.
Wounded, alone, and afraid of being found, Loki disguises himself as a common Midguard creature to keep himself hidden. He is found by a young woman who - unknowingly - takes in the trickster God and nurses him back to health. Loki finds himself torn between messing with this mortal to get what he wants, or to return to Thor and help his brother.
The mortal in question, though, has no idea who she has saved, and what crazy, messed up world she has been hurled into.