Once you have the normal .rar or .7z file, extract it. You should see a single .iso file. Use a tool like 7-Zip to check the integrity.

The demand for a shows that players want to experience this lost title in the best way possible—not through a blurry, low-FPS original, but through enhanced emulation.

Search for the "Onechanbara Special HD Texture Pack" on dedicated emulation forums. These are usually .paki or loose texture files that you place in the xenia/content/ folder.