Chainsaw katana
For proper functioning, you need to install Optifine or CITResewn.
This resource pack transforms an ordinary sword, turning it into an elegant katana. There's a special feature: when you hold the katana in your off-hand, it automatically sheaths itself, adding realism to the weapon carrying process.

To activate the visual change of the sword, simply rename it using an anvil, giving it the name "Chainsaw". After this, your regular sword will visually become a katana crafted in the best traditions.