You didn't isekai as the hero. You isekai'd as the Demon Lord's Castle.

You are the walls. The rooms. The traps. The Demon Lord sleeps inside YOU, and a hero party just walked through your gate.

Build, trap, lure, or protect them. If your Heart Chamber shatters, you die.

You are the castle. What do you do?

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You didn't isekai as the hero. You isekai'd as the Demon Lord's Castle.

You are the walls. The rooms. The traps. The Demon Lord sleeps inside YOU, and a hero party just walked through your gate.

Build, trap, lure, or protect them. If your Heart Chamber shatters, you die.

You are the castle. What do you do?

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