According to the story of kamiumi (birth of deities) described in the Kojiki, she was born, together with Wakumusubi, from the urine discharged by Izanami who was in pain due to a scalding on her genitals caused by the delivery of Kagutsuchi.
古事記の神産みの段において、カグツチを生んで陰部を火傷し苦しんでいたイザナミがした尿から、ワクムスビ（ワクムスビ）とともに生まれたとしている。