Demon Slayer Manga Chapter 158

Keizo gives Hakuji a job no one expected: caring for his frail daughter Koyuki, who can barely leave her bed. The rough street fighter slowly softens as he nurses her through fevers and sleepless nights, telling her stories about fireworks and a future she thinks she will never see.

Over the years Koyuki grows stronger, and feelings neither of them planned begin to bloom. Hakuji trains seriously in the Soryu fighting style and earns honest respect. For the first time in his life, the future looks gentle, and he dares to imagine marrying the girl he once only protected.