[Demon Slayer] Marrying the Ultimate Catch

[Another short story about Enichi, still a son-in-law, but the female lead is now his older sister instead of his younger sister]

You've transmigrated to Japan during the Sengoku period, at least five hundred years before Muzan's death.

Your daimyo father is gravely injured and near death, and with no male heir in the family, you're faced with the problem of finding a husband to marry into the family.

The good news is, you've found that invincible man!

The bad news is, that invincible man is seven years old (.)

* Demon Slayer only, Sengoku setting. The female lead is the daimyo's only daughter, and Enichi is a young son-in-law. A growing-up romance.

* Alternates between second and third person. The female lead is older, with an eight-year age gap. No romance before both are adults.

* I'm writing this to get back into practice, updates are irregular and there's no outline. It's very short, so how much more irregular can it get? (shrugs)

Theme: Love makes people better.