Demon Slayer: My Son Is Kokushibo, and He Marries Muzan from the Start

What amusing things would happen if Muzan Kibutsuji married Yoriichi Tsugikuni?

After transmigrating into Demon Slayer, I somehow became Tsugikuni Kaedemoto, the father of Yoriichi Tsugikuni and Tsugikuni Michikatsu, and thus began this bizarre life.

After a great deal of effort, I captured the wicked, cowardly demon Muzan and brought her back to the Tsugikuni estate. Hoping to reform her and help her become a better person, Kaedemoto carefully planned her daily schedule.

A cup of Wisteria tea in the morning, some time in the sun at noon to get more calcium, and housework in the evening to keep her fit, with the occasional massage from a Nichirin Blade.

Muzan said that since she couldn’t win, she had no choice but to endure it. She would keep enduring until the old Tsugikuni man and Yoriichi Tsugikuni were near the ends of their lives, and then she would be free again!

But as the reform went on, Muzan somehow fell in love with Yoriichi and inexplicably became the Tsugikuni family’s daughter-in-law.

Though Muzan believed that those who endured the greatest hardships would rise above others, she never gave up on escaping. But after enduring for a hundred years, when she saw Yoriichi still full of life, all that remained on her face was a smile of utter despair.

Muzan Kibutsuji: “Yoriichi Tsugikuni, why did you turn into a demon too?!”

(Muzan is female by default. This will not change.)