Rebirth of the Demon King

This is a fanfiction that takes place after the epilogue of the manga "Demon Slayer: Kimetsu no Yaiba"
Muzan Kibutsuji, the creator of demons, dies in the final battle of demons and humans and is born again.
Unaware of the sins he committed in his past life, he becomes a fine, handsome 19-year-old.
His ambitions are still there, and so is his wish to live forever.

Sayuri Akuma, A witty, sarcastic, and extremely beautiful normie. At 7, her parents abandoned her.
She couldn't care less about anything -except Giichi- and is always ready to put her life on the line, just for him.

Giichi Tomioka, the descendant and rebirth of Giyuu Tomioka-The water hashira. He is just like his past life, cold and serious.

Giichi and Sayuri's blooming love takes an abrupt turn When Muzan falls in love with Sayuri at first sight. They become close friends, and Muzan's personality slowly changes. He begins to love the sun and appreciates everything.

Until she tells him about her feelings for Giichi.