The Executioner Princess of the Doomsday Ruins and City of the Dead

Humans are filthy and ugly creatures. When the end of the world comes, they will turn into true monsters to serve their own interests... And me, the last surviving human in the world, must choose: accept the dead's harem and ensure humanity's continuation? Help mechanical humanoids explore the future of eternal life? Or join the A-types and embrace their blessings and evolution?

Or perhaps, like a human, think only of my own life?