Dean is a supernatural hunter with his little brother, Sam or as he calls him 'Sammy'. They are best friends with a litterl angel, cas. They are always doing cases, know Lucifer, god, Crowley and Rowena even helps them.

They are on a case when they see a girl, killing vampires with an axe. She's covered in blood and softly singing a sea shanty as if nothing is even happening. Dean immediately falls in love with her, but tries to hide it.