Metal Sword Demon Slayer - Giyu Tomioka Blue Nichirin Katana 337/349/3012

Nichirin Blades are special blades used by and made specifically for the Demon Slaying Corps to slay Demons. They are forged from a unique ore that constantly absorbs sunlight, one of the only major weaknesses of Demons. Therefore, decapitation by Nichirin Blade is one of the only ways a human can kill a Demon, the other being the use of a Wisteria-poison coated weapon.

Nichirin Blades take on a distinct color when first drawn by its owner, which is why they are also referred to as "The Color Changing Swords". However, the holder is required to have a certain amount of skill, or the blade will not change color.

The blue Nichirin Blade symbolizes water and Giyu Tomioka, the Pillar of Water of the Demon Slayer Corps, wields a blue blade that he uses with his Breath of Water style, making him one of the most formidable among the Pillars.

Tomioka's fighting style is very water-like. He moves in a fluid, almost effortless motions to make short work of demons. He killed both the Father Spider Demon and Rui, the Lower Moon Five demon, with one fluid motion in each kill.