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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 travels right, she will come across a few small haniwas blocking her path. Interacting with them will cause them to melt out of her way.
The next part of the 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 forward. 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 end of the path, you will witness the Haniwa Dance Event.