Ximi rescued a human who had lost his memory.
Though the human had amnesia, he was exceptionally good at reading people and winning them over, and had an incredible gift for magic. Before long, he and Ximi became roommates, friends, family, and lovers.
Later, Ximi died in his arms.
When he opened his eyes again, the weak little fairy had become the Seventh Demon King, the last Demon King of legend, who would bring about the world's destruction.
The Demon King was remarkably calm and had no interest whatsoever in destroying the world. He only wanted to go find his human.
But when Ximi found him, he discovered that people called his human the Chosen One.
The Chosen One's glorious deeds had spread across the continent. The people begged him to kill the Seventh Demon King, who had inherited all the power of the Abyss, and put an end to its calamity.
Ximi, who was now a Demon King but still thought of himself as weak and helpless: ?!
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Three hundred years after his lover died, a mage researching resurrection magic saw a new apparition in his mage tower.
The apparition waved at him, pinched his cheek, stole his magical reagents and interrupted his experiments. Then it rose onto tiptoe, wrapped its arms around him, planted a big kiss on him, and said, "It's me, it's me! I'm back!"
*Cool, reserved Chosen One mage top x pitiful little fairy bottom. Devoted to each other in body and heart, one-on-one, first love for both. No cheating, no switching, no dream sequences. Both are straightforward gods.
*This is fantasy that is particularly un-fantasy-like. Every setting exists to serve the couple's romance. In short, the plot is: being lovestruck really can save the world.
*A heads-up: the blurb is from much later in the story, because I'll spend a lot of time writing about their early days together...
Premise: Those with strong enough hearts can find love and peace.