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)
Standard Nichirin Katana: As a Demon Slayer, Giyu carries around a standard sized and shaped Nichirin katana. His katana's hilt is hexagonal shaped and has an overlapping fuschia border. As a Hashira, Giyu's blade has the words Destroy Demons (惡鬼滅殺 Akki Messatsu) engraved on the side. The blade is a two tone black and silver carbon steel blade and is approximately 69 cms long. With his katana, Giyu has a standard sword sheath and this version is red in colour. The handle is black painted faux ray skin with a white wrapping and red metal alloy fittings.
Blade Length : 69 cm approx
Handle Length : 29cm approx
Overall Length : 104 cm approx