Slay the Demon King, retire in glory, and transmigrate. That was how the journey was supposed to go.
Instead, she failed to retire. After her marriage proposal to the teammate she trusted most was rejected, he stabbed her in the back, and she fell from being a hero to a complete good-for-nothing.
To escape that obsessive madman, she had no choice but to flee to a border town, ready to spend the rest of her life alone.
Until one night, she found the Demon King, who had been stabbed to death a month earlier.
"Weren't you dead?!"
"...I was dead, but not completely."
"Then die again!"
It turned out that the useless hero couldn't hurt him, while the dumb Demon King had no desire to kill her. With neither of them knowing what to do, various circumstances forced them to reach an agreement and live together.
At mealtimes, she had to teach the dumb Demon King how to use utensils and stop eating raw food. Their days felt just like a single-parent household raising a kid.
When they went out...
"You hate that person who's always chasing after you. Why not just kill him?"
"It's called having manners, got it? Otherwise, I'd have stabbed him to death ages ago."
"So you're showing me manners now, too?"
"...You're so annoying."
After N days together, looking at the Demon King, now handsome and imposing, with the beginnings of a human form, she felt a surge of emotion: "Heh, my silly son has grown up."
Then that silly son finally caught on.
"...You like me? Seriously?"
"You taught me that liking someone means wanting to be with them forever."
"Then don't you dare take it back, okay?"
Meanwhile, in the Holy City, the obsessive suitor who had been forced to cast her into the abyss looked at the girl who should have been standing before him as his bride and finally realized something far too late: he had been wrong from the very beginning, and utterly, completely wrong.
