The world is ending, and Rose has given up, her life forfeit the day she decided to try and fight her fate, but she decided that she wouldn't let her end be in vain and threw herself at the enemy destroying her world.
Varia is a Goddess who has felt lonely ever since she was born, as the goddess of death and destruction, she has overseen all worlds in her multiverse for eons, but has wanted someone to share this life with, when she finds the soul of a heroic woman, she decides to reincarnate the soul as the young goddess of a new world, so that she can grow to match Varia's strength.