Quick answer
Story progress from the demo does not carry into the full game. Keeping demo save data grants the Kubi Akari Charm, and Capcom's August update also says it boosts Musashi's stats in the full game.
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Verified answer
Xbox's current demo page is explicit that saved progress cannot be carried into the base game and that the demo differs in some respects from the full game. Do not plan around keeping mission position or inventory.
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Player-useful details
The save file still has value: it is the eligibility signal for Kubi Akari, an equipable charm that strengthens Musashi. Keep the local or cloud save until the retail game has detected it.
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Current evidence limit
For Demo save transfer and full-game rewards, the current evidence limit is specific: mission position, inventory and story progress do not transfer; only the stated save-data rewards apply.
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Questions players ask
What is confirmed about Demo save transfer and full-game rewards?
Story progress from the demo does not carry into the full game. Keeping demo save data grants the Kubi Akari Charm, and Capcom's August update also says it boosts Musashi's stats in the full game.
What is still unknown about Demo save transfer and full-game rewards?
For Demo save transfer and full-game rewards, the current evidence limit is specific: mission position, inventory and story progress do not transfer; only the stated save-data rewards apply.
Official sources
