Interact with a save/rest point after completion
After finishing the Demo, return to the game and interact with a save/rest crystal. A developer's reply gives that interaction as the way to reach the secret shop. Players also mention collecting the Boss's completion item and interacting with the post-Boss altar.
On this page
Start from a completed, playable Demo save
- Finish the Demo
Complete the Boss section and its completion interaction.
- Return to play
Be back in a scene where you can control the character.
- Use the crystal
Interact with a save/rest point to reach the shop.
The developer's shop reply says to interact with the save/rest object after finishing the Demo. In a player follow-up, the Boss item and the altar after the fight are mentioned as completion details.
If you defeated the Boss but did not finish the follow-up interaction, that is the part to check. Another community reply describes returning to the game after the fight, then using the crystal.
Recognize the crystal you need to interact with

The opening guide's first-rest step shows one example of this object. Use the crystal interaction after completion rather than searching for a merchant on the ordinary opening route.
This instruction concerns the interaction with the object. It does not mean selecting ordinary Rest in the menu is itself the shop command.
Use the merchant for the equipment problem you have
If an evolved Rusted Sword no longer performs the lunge, check the community's replacement-sword advice for restoring the old action.
If your Jar Club broke and left a Symbol of Jigeki, the merchant is the reported next stop for selling it and checking the reinforced replacement.
The opening Rest menu remains the separate normal-healing topic. Entering the secret shop is a completion unlock rather than the same task.