What do you imagine when you hear the word katana or “Japanese sword”? Japanese anime, such as Naruto, or the samurai killing each other of Takeshi Kitano movies? Well, in Japan, katana are offered to the gods because of their spiritual characteristics. People believed katana have three significant characteristics: purity, rarity, and value. The Japanese myths tell us about the three secret treasures of Japan and katana are one of them, followed by the secret mirror and the comma-shaped beads. The first offering made to the gods was recorded in 3 B.C.