This is set a few years post-apocalypse. Dean has been a lonely ex-hunter for quite some time, and Castiel finally shows up. Cruel words are exchanged, and it's mostly just angsty stuff! Some hints of previous Destiel.
A hybrid named Scarlet was thrown into Dean and Sam's care, wondering why she was even born. She soon is to realize that she is the daughter of Crowley and Anna, and Anna wants to use Scarlet for power. Scarlet realizes that she can not trust anyone, due to betrayal at every corner.