Turns Out I'm the Father of the Kokushibo Brothers

-[Hokuriku Road Arc]

To get the perfect ending on my second playthrough of life, I worked hard from childhood, studying literature and martial arts alike. At fifteen, I married a wife as beautiful as a celestial maiden. Then I inherited the family estate and was just about to secretly kick the Ashikaga clan out of power and take their place. Ahem, by which I mean rebel.

When I was eighteen, my wife got pregnant.

She gave birth to twins. The servants were terribly nervous, saying the younger son's forehead bore a flame-like mark, and that he had been silent since birth, surely an ill omen and possibly disabled.

I froze on the spot.

I saw the mark on my newborn son's forehead.

Wait, what do you mean my son has a birthmark?!

My surname isn't Tsugikuni, either

"Lord! The Great Shogun has granted you the surname Tsugikuni. This is cause for celebration!"

Me: "..."

Me: Damn it!

-

Uesugi Hisakatsu, now using the surname Tsugikuni, is currently the father of the sun and moon twins, a notorious wife-beater, Sengoku's number-one lunatic, a mentally twisted patient, a fool who can't recognize a top-tier SSR, the stereotypical East Asian deadbeat father, the cause of family discord, the leading believer in superstition, and a man who embodies so many flaws that everyone wants him dead...

Hisakatsu: "..."

He wiped his face and decided he had to turn over a new leaf, No, why the hell should he? He'd never done any of that!

These were two top-tier SSRs, the best of the best!

I'm coming to unify the land, hahahahahaha!

-

Bonus scene:

From childhood, his father taught Michikatsu that he was destined to become the Great Shogun, that the whole country would belong to him, and that Yoriichi would be his most loyal retainer.

He worked hard toward that future.

But why did his father hand over the family headship to him when he was only thirty-four?!

What do you mean he has to conquer the land himself?! QAQ

His father is in the prime of his life. Why has he decided to lie flat?!

Bonus scene 2:

While out one day, Yoriichi encountered a man-eating demon and used his Breathing sword techniques. The Demon Slayer Corps came calling again and again, and after much deliberation, Yoriichi finally went to visit them.

Yoriichi was a kind child. He didn't want man-eating demons to slaughter the people in his lands, so he generously taught the members of the Demon Slayer Corps his Breathing sword techniques.

When the old father came out to fetch his son, he discovered the existence of the Demon Slayer Corps.

The old father applied to join.

Yoriichi couldn't find an option to refuse him.

The old father was kicked out of the group chat for lacking talent.

The old father flew into a rage.

Michikatsu applied to join (Note: Recommended by his father.)

Michikatsu successfully mastered Moon Breathing.

One night, the twins encountered the Demon King while out.

The Demon King: dead.

-

1. Demon Slayer alternate-universe story, set around 1460 or later. Some details will be changed. It takes liberties with both history and the original work.

2. Michikatsu never develops the mark, so he lives longer.

3. The parents' romance is part of the story, so it's categorized as romance.

4. I personally want to give the twins a happy childhood and life.

5. Dad is a jack-of-all-trades but an ordinary person, with only two sons.

6. It's fine if you haven't read the original. Most of the content will probably be original, while still fitting in with actual history.

7. The story will only use the name Uesugi Hisakatsu, to distinguish him from the Tsugikuni father. Their mother's name is A Zhu, and I haven't decided on a surname yet. Here's a story from the Hokuriku Road.

Theme: Strive for a happy life.