After surviving a surprise demon attack at night, twenty one year old woman Miya Kamado and her whole family, consisting of her healthy forty eight year old parents Tanjuro and Kie and twelve year old quintuplet siblings Nezuko, Takeo, Hanako, Shigeru and Rokuta, are forced to abandon their mountaintop home and travel through Japan. During this, the family stumbles upon a battle between the teen Demon Slayer Corps member Kanae Kocho and the sadistic, cold natured and powerful demon Doma. Unwilling to stand back and let a person die, Miya sacrifices herself to save Kanae, resulting in the young woman being put on the brink of death. After perishing, Miya is seized by Doma, who brings her lifeless body back to his temple. There, he turns her over to his master, who turns her into a demon in order to revive her. Several months later, she makes her way to Tokyo. There, she is found by the female demon Tamayo, who later frees Miya from the curse binding her to the demon king. Afterwards, she leaves Tokyo after being given a spear and bow and a map to guide her to the mountaintop forest home of orphaned eleven year old twin boys Yuichiro and Muichiro Tokito. Miya spends the next several months living in the mountaintop forest with them.