Ashinazuchi and Tenazuchi
In ancient Japanese stories called the Kojiki and the Nihon Shoki, there was a god named Susanoo who was sent away from his home in the heavens to live on Earth in a place called Izumo. There, he met an old couple named  who were children of a mountain god called Ōyamatsumi. They told him about a scary monster called Yamata no Orochi, which had eaten seven of their eight daughters. Susanoo offered to kill the monster if they would give him their only surviving daughter, Kushinadahime, to be his wife.