For correct work you need Optifine or CITResewn

This resource pack adds several demon slayer anime katanas directly to your minecraft!

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To get a katana, just rename any sword!

Katana names

Rename your sword "Shinobu" to make "Katana Shinobu"
Rename your sword "Tanziro" to make "Katana Tanziro"
Rename your sword "Inoske" to make "Katana Inoske"
Rename your sword "Tomioka" to make "Katana Tomioka"
Rename your sword "Zenitsu" to make "Katana Zenitsu"

To get a kimano, just rename any chestplate!

Kimano names

Rename your chestplate "Shinobu" to make "Kimano Shinobu"
Rename your chestplate "Tanziro" to make "Kimano Tanziro"
Rename your chestplate "Tomioka" to make "Kimano Tomioka"
Rename your chestplate "Zenitsu" to make "Kimano Zenitsu"
Rename your chestplate "Urokodaki" to make "Kimano Urokodaki"

To get a mask, just rename carved pumpkin!

Mask names

Rename carved pumpkin "Urokodaki" to make "Urokodaki mask"
Rename carved pumpkin "Sabito" to make "Sabito mask"