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)
As a Demon Slayer, Zenitsu has a standard sized and shaped Nichirin katana with lightning streaks along the entire blade. Our version is 66.5cm long and is a black and silver painted carbon steel display blade. His sword's hilt is circular shaped with 4 slight indentations, the center has a white tone in our version with small triangles and has a golden border. With his katana, Zenitsu has a standard sword sheath made of timber and painted white in colour in our version. The koiguchi and kojiri are made of a metal alloy and are gold in colour.

Blade Length : 66.5cm approx
Handle Length : 29cm approx
Overall Length : 97.5cm approx