The supposedly invincible, corrupted Demon King charged ahead, ostensibly conquering the world but actually seeking revenge. Once his vengeance was complete, he planned to fake his death and escape, but a slip-up got him truly killed by Alice, the Saintess of the Anlus Church, the only religion on the continent.
Damn! Whatever, I got my money's worth out of this life!
Who knew I would be reborn, and reborn as Alice, no less?
The world line has changed, too. The Church can now overpower the Demon King completely?
What? To bring about peace, I have to marry the Demon King?!
Which means... marry myself?!
You've got to be kidding me. I'm straight! (Puts on white thigh-highs)