Kokushibo Katana in Manganese Steel with Blue Flame Hamon Blade and Black Lacquer Saya

The blade is forged from manganese steel and finished in a deep, saturated blue that transitions dramatically at the edge into a white flame-patterned hamon. This raging-fire hamon style is the sword's most immediately striking feature - the irregular white wave runs the full length of the nagasa, creating a sharp visual contrast against the blue body. At 40.5 inches overall with a 1.26-inch blade width, the geometry stays faithful to a full-scale katana silhouette. Collectors looking for a standout piece in this finish will find more options in our Blue Katana Sword collection.

The tsuka is wrapped in black PU leather with a textured, close-fitted pattern and secured with white alloy fuchi and kashira end caps. Three gold-tone kanji characters are inlaid along the handle face, adding a layer of visual detail that reads clearly up close. The full tang construction runs the blade steel through the entire handle core, giving the assembly a solid, unified feel consistent with the Kokushibo design reference.

The tsuba is cast from alloy in white with a raised flower motif across its face - a deliberate contrast element against the otherwise all-black handle assembly. A gold-tone habaki collar sits immediately below, bridging the guard to the blue blade and tying together the sword's three-color palette of blue, black, and white with gold accents.

The black hardwood lacquer saya is one of the more detailed components in this build. The entire surface is carved with a continuous vine relief pattern, giving the scabbard texture and depth that plain lacquer finishes lack. Three gold kanji inlays are positioned along the saya body, mirroring the handle detailing. A black sageo cord completes the koshirae fittings. For more swords built in this style, explore our Real Japanese Katana Sword collection.

Overall dimensions: 40.5 in length, 1.26 in blade width, 0.275 in spine thickness, 3 lb weight. Shipping weight is 4.4 lb in a 43.3 x 3.93 x 3.14 in package. Sword stand is not included. Designed as a Demon Slayer - Kokushibo replica collectible.