Headcanon: Chief of Heaven had two children, the son was Hinomiya (日宮) , the Lord of the Sun and the daughter was Eve, the Goddess of the Earth. No matter how much he cherished the two of them, they didn’t seem to enjoy staying in the Heaven with him.
Hinomiya and Eve got along very well. Whenever the Goddess finished her job on the Earth, she always came to her elder brother’s palace and even spent the night there. Eve loved sharing her stories about the lifes on Earth with Hinomiya, and later about a certain Death God.
After Eve’s death, a ray of her light reached Hinomiya’s place asking for his help. Hinomiya loved Eve so much that he promised to look after that fallen god in his every human life. He later returned to the Sun after the fallen God was forgiven and his last human life finally ended.