To Preserve World Peace, We Must Physically Make the Demon King Reincarnate

The Demon King, feared by all and ruler of monsters, is about to destroy the world in accordance with a pact made 200 years ago, when suddenly a girl named Soga Koria appears before him. Her age is a mystery. She can't use magic, but her physical attacks are incredibly powerful, and she's a perfectly legal loli.

Koria: For the sake of world peace, I hope you'll reincarnate as soon as possible.

Demon King: Huh? Sure! If you'll marry me after I reincarnate, I could even reincarnate and hold the wedding right here and now. Destroying the world is such a trivial matter; I don't need to do it at all.

Koria: ...Did you get the wrong script or something?

Content warnings:

1. Lighthearted adventure, one-on-one romance, happy ending.

2. Both leads are max-level powerhouses who enjoy pretending to be noobs in beginner villages and beating up monsters.

3. A sweet romance.

4. Demon King: I suspect the heroine is making a dirty joke, and I have proof. Let me get in on it!

5. Told from the heroine's perspective, so don't be fooled by the blurb.