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, Inosuke carries around a standard sized and shaped Nichirin katana but instead of one, he has two, both of which he shaped a jagged edge like a beast's teeth and jaws, perfect for tearing through flesh, which is more to his liking. His dual blades are black and silver carbon steel painted. Unlike his fellow Demon Slayers, Inosuke doesn't have a tsuba and uses bandages to tie his katanas. In addition, his blades don't have words engraved on it.
This katana has a white imitation leather flexible sheath and the blade is approximately 66.5cm in length.
 
Blade Length : 66.5cm approx
Handle Length : 29cm approx
Overall Length : 97.5cm approx