Fiery Suns

After a overnight stay in a house at the bottom of the mountain they live on, thirteen year old girl Sumiko Kamado returns home to discover her five siblings, twelve year old triplets Nezuko, Takeo and Hanako, eleven year boy Shigeru and ten year old boy Rokuta, all dead in the snow with their parents Tanjuro and Kie both missing. While Sumiko is trying to find out what she should do, her five siblings are revived as demons and tackle her to the snowy ground. However, her life is saved when young man Kagaya Ubuyashiki, who leads a ancient organization known as the Demon Slayer Corps, hauls the five newly turned demons off her and helps her get up off the snowy mountain ground.