Flaring Sunbeams

On their way home from the town at the bottom of the mountain they live on with their family in late December 1907, twenty one year old woman Saki Kamado and her older sister, twenty three year old woman Cybele, bump into the demon king, who badly injures them and gives his blood to the young women, causing them to fall to the ground and black out when he leaves. They make their way up the smooth mountain path to their home the next morning. After getting home, they open the front door and the sisters' six younger siblings, eight year old sextuplet children Nezuko, Takeo, Hanako, Daichi, Shigeru and Rokuta, and their parents, healthy forty five year old married couple Tanjuro and Kie, are stunned to see them as demons with their memories and voices intact and a immunity to the sunlight. A little over four years later, this is discovered by the wind pillars Sanemi Shinazugawa and Masachika Kumeno, both of whom are also lifelong friends, when they see the sisters enter the family's small mountaintop home at sunrise. This leads to a intense battle at the end of which they knock both Cybele and Saki out and return with the sisters to the headquarters of the organization they are members of after hauling the two women over their shoulders.