What if Yoriichi hadn't left the Kamado's with just the knowledge of Hinokami Kagura, otherwise known as sun breathing? What if he told him about his brother's breathing style as well, to keep an old part of him alive before his descent to darkness? Every generation, the oldest Kamado boy, is given the earrings and later performs Hinokami Kagura, a traditional dance for generations. As well as this, the oldest Kamado girl performs Suijin no Odori, the dance of the water god, otherwise known as moon breathing. Akari Kamado is the eldest child of Kamado's, one year older than Tanjiro. She helps her mother take care of her siblings, and after her father's death, helps her brother sell charcoal to keep afloat. But what happens when her life gets completely flipped upside down when most of her family is killed by a demon? How does she act, knowing her little sister is one of them? And how will she keep the rest of her family safe as they enter the demon slayer profession? Find out in Suijin no Odori: Waning of the Moon.