Susanoo, the storm kami and brother of Amaterasu, is banished from the heavenly realm and descends to Izumo. There he finds an old couple and their daughter Kushi-nada-hime weeping because the eight-headed serpent Yamata no Orochi has devoured seven daughters already and is coming for the last.
Susanoo has the family prepare eight vats of strong sake. Orochi drinks, falls asleep, and is cut down. Inside the serpent's tail Susanoo finds the sword later called Kusanagi, which he offers to Amaterasu. The story turns a frightening river-landscape monster into a rescue, a marriage, and the origin of a sacred sword.