Just as Kevin, who had become the Herrscher of the End, was about to destroy the world, a mysterious white-haired saint sealed him away. When he opened his eyes again, not only had Kevin turned into a girl named Kiana, he'd also become his past self's younger sister?
Determined to become the End's Demon King and destroy the world again, Kiana decides to guide her past self down a path of corruption, turning him into a Demon King bent on destroying the world, then possess him. But as Kevin gradually becomes a savior, Kiana falls into deep self-doubt. She also begins to uncover the truth about her past life and learns who her true enemy is.
But why are my past life's followers so hostile toward me? I'm really not a saint! And all of you, stop throwing yourselves at that foolish version of me!
My name is Kevin. I have a home and a little sister, and both my parents are dead. I'm an ordinary college student at a university in the Far East. It's just that my sister has been acting a little strange lately. Then we were attacked by mysterious pursuers and discovered some of the world's secrets.
With my sister's help, I became a savior and brought the Honkai to an end. I thought I could go home with her and enjoy retirement, but then an antimatter army descended from the heavens, leaving me deep in thought.
