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The Haniwa Temple (遺跡, Iseki, Ruins) is an area accessible from Sign World by interacting with the collection of grey stones near the pyramid.
When Urotsuki first arrives in the area, she will be on a grassy path with rock sculptures and cave people in the background. If she travel right, she will come across various small haniwas in blocking her path. Interacting with them will cause them to melt out of her way.
The next part of this area is a large staircase, similar to the one leading up to the Sky Garden in Yume Nikki. At the top of the staircase is a room with a grey moving haniwa with a smaller immobile one near it, obstructing the path to another area. Interacting with the moving haniwa gives Urotsuki the Haniwa effect. Equip this effect to move the smaller haniwa out of the way. When Urotsuki goes up to the doorway at the end of the path, you will witness the Haniwa Dance Event.