in the kojiki, after giving birth to the fire god, "kagu-tsuchi", izanami dies from wounds of its fire and enters the perpetual night realm called yomi-no-kuni (the underworld) that the gods retire to and where izanagi, her husband, travels to in a failed attempt to reclaim her. he discovers his wife as not-so beautiful anymore, and, in a brief argument afterwards between them, she promises to take a thousand lives every day, signifying her position as the goddess of death.