Demons ravage the world, and only Demon Slayers can stop them. Kagami Yamato is not only on a journey to stop, but to also find herself. Gifted a Breathing Technique not seen in over hundreds of years, she and Tanjiro Kamado find the demon who murdered his family and turned his sister into a demon. But ancient secrets between their bond threaten to expose them to Muzan Kibutsuji.