Boundary of This World and the Netherworld

The Focus Shot of Yukari Yakumo from the world with a never-ending winter (a Touhou LW original). She attacks with green bullets and blue bullets. ''This world'' is the world of the living, the real world where people live. And the Netherworld is the world of the afterlife. According to various mythologies all around the globe, back when the world was still new, there was no separation between the living and the dead. There are records that state it was possible to walk from the world of the living to the Netherworld.

There is a theory that the custom of stacking stones came about because people wanted to create a boundary between life and death. The weight of the stones would seal the dead who were buried underground.