粟田口康綱（凶剣）Sword of curse

粟田口康綱Awataguchi_yasutsuna（凶剣 Sword of curse）,japan
It was said that the person who obtained this sword was always crazy, and violated the mass murder. A famous samurai who had this sword was a sudden cutting killing the farmers of the street clinging, and committed harakiri suicide. There are a lot of stories that look like this in Japan, and a similar story is handed down to the Ainu race.