Prologue: Indulgence Order

"When the Earth splits in two... Let's see what's inside."
When the Priestess descended to Earth and justice was done, she chose two dead fake sinners who were one more time sent to the world of alive. She did it for a reason, but for certain purposes. She will give them another life exchange for the lives of two girls. What are the goals of the Priestess and why did she need to change the fate of two completely different young girls living at different times? She'll do this with the help of two young guys who died at different times for ridiculous reasons...