legend of Izumo Susanoo须佐之男 - from Japanese Mythology

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In Japanese mythology, Susanoo, the powerful storm god, is the brother of Amaterasu, the goddess of the Sun, and of Tsukuyomi, the god of the Moon. All three were born from Izanagi, when he washed his face clean of the pollutants of Yomi, the underworld. Amaterasu was born when Izanagi washed out his left eye, Tsukuyomi was born from the washing of the right eye, and Susanoo from the washing of the nose. Susanoo used Totsuka-no-Tsurugi as his weapon. 
Izumo, where he met an elderly couple who told him that seven of their eight daughters had been devoured by the eight-headed dragon Yamata no Orochi and it was nearing time for their eighth, Kushinada-hime (櫛名田比売) 
This sword from the dragon's tail, the Ama/ Ame-no-Murakumo-no-Tsurugi (天叢雲剣, "Sword of the Gathering Clouds of Heaven") or the Kusanagi-no-Tsurugi ("Grasscutter Sword")