Susanoo Slayes Yamata-no-Orochi
On his way down from the banished heaven to the earthly realm (Izumo), Susanoo meets the weeping parents of a family whose daughters are being devoured by the eight-headed, eight-tailed serpent Yamata-no-Orochi; seven of the eight daughters have already been eaten, and the last, Kushinada-hime, is next [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗. Susanoo asks for her hand, turns himself into a hair-comb, and has her wear it in her hair [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗. He prepares eight vats of sweetened sake and sets out eight cutting-stations; when the serpent drinks and comes to drink, Susanoo slays it, and in its tail he finds the sword Kusanagi (Ame-murakumo-no-tsurugi) [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗. He rescues Kushinada-hime and marries her [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗. This is the archetypal Japanese monster-slaying myth and the origin of the sacred sword Kusanagi [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗[S2]S2 · *Nihon Shoki* ('Chronicles of Japan', 720 CE) — PRIMARY TEXT (annalistic + mythographic) — (translation: G. Cameron, 1968; see Internet Arch.
Shinto is a living religious tradition. These narratives are presented as the tradition's own mythic heritage, with the historical layers (Kojiki 712 CE, Nihon Shoki 720 CE, shrine engi) made visible. Modern state-Sinto and pop-culture readings are labeled separately from the primary texts.

The method of the slaying (the eight vats of sake, the cutting-stations) and some details differ between the Kojiki and Nihon Shoki [S1]S1 · *Kojiki* ('Records of Ancient Matters', 712 CE), trans. Basil Hall Chamberlain (1882/1933) — PRIMARY TRANSLATION — https://sacred-texts.com/Open source ↗[S2]S2 · *Nihon Shoki* ('Chronicles of Japan', 720 CE) — PRIMARY TEXT (annalistic + mythographic) — (translation: G. Cameron, 1968; see Internet Arch.
The Weeping Parents

The Comb
The Slaying
The Sword and the Bride

Variants of this story (2)
The full account: the weeping parents, the comb, the eight vats of sake, the slaying, and the sword in the tail.
A related account with different wording of the method (the sake, the cutting) and some details.