The official PlayStation page lists a free Onimusha: Way of the Sword DEMO for PS5. The listing confirms that the demo can be added to the library, but it does not explain its exact chapter, length, save transfer rules or unlocks.
What the demo page confirms
The demo is presented as a separate free product alongside the full game and its editions. That makes it the clearest low-risk way to sample the game's swordplay before buying, but the official page does not promise that all final systems appear in the demo.
What is not confirmed
Do not rely on unverified claims about demo completion rewards, a shared save, demo-exclusive content or the exact point at which it ends. Those details need to be checked in the released build and will be added here after testing.