In the "Demon Slayer: Kimetsu no Yaiba" series, the sword wielded by the character Giyu Tomioka is known as the "Nichirin Blade." Giyu's Nichirin Blade is depicted with a blue color. The specific hue of blue associated with his sword is often described as a deep or dark blue. Each character in the series possesses a unique color associated with their sword, and Giyu's sword is distinctively depicted with this shade of blue.