Demon Slayer: Kimetsu no Yaiba is a Japanese manga series written and illustrated by Koyoharu Gotouge.
The story takes place in Taishō-era Japan. It follows Tanjiro Kamado and his sister Nezuko Kamado as they seek a cure for Nezuko's demon curse. Tanjiro and Nezuko become entangled in the affairs of a secret society, known as the Demon Slayer Corps, that has been waging a secret war against demons for centuries. The demons are former humans who sold their humanity in exchange for power, and they feed on humans and possess supernatural abilities such as super strength, magic, and regeneration. Demons can only be killed if they're decapitated with weapons crafted from an alloy known as Sun Steel, injected with poison extracted from wisteria flowers, or exposed to sunlight. The Demon Slayers, on the other hand, are entirely human; however, they employ special breathing techniques, known as "Breathing Styles", which grant them superhuman strength and increased resistance. (Wikipedia direct reference)
After the Swordsmith Village Arc, Tanjiro Kamado's hilt is changed to the one used by Kyojuro Rengoku, shaped like a flame with a yellow core and orange border. With his katana, Tanjiro has a standard sword sheath that is deep black in colour and is approximately 66.5cm in length. The blade is a black and light green painted carbon   steel. His blade also has the words Slay (
(Metsu) painted on it. The metal koiguchi and kojiri are silver in colour.  This sword is perfect for decoration and is a must have for any fan of the Demon Slayer series.
 
Blade Length : 66.5cm approx
Handle Length : 29cm approx
Overall Length : 97.5cm approx