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~In the village, death inevitably takes the people when they reach 50 years of age.~By custom, the villagers are bound and taken to The Netherworld, the other side of the mountain. The girl Anzu sacrifices the elder sister of the twins. Officials clad in beast-skin manage the village "The Living World", whose people are watched over by the gods. And the mysterious People of the Mountain... Anzu sees both hope and despair ahead.The story reflects the author, Yamashita Kazumi's unease for the nation of Japan.
Their world is a village with four gigantic gods overseeing them from each direction. They are forbidden from going out at night, and they believe that when they reach the end of their lives at age fifty, they travel to the “beyond” that exists past the mountains. When this land is ravaged by famine, a man named Sutekichi is ordered to sacrifice one of his twin daughters to appease the gods. Left with no choice, he takes one of them—cursed with an “evil countenance,” according to the priests—and abandons her in the mountains. But what will happen ten years later when An, the surviving twin, begins to grow more curious about how this world works? Winner of the Tezuka Osamu Cultural Prize for manga, this sci-fi thriller explores ancient customs, mysterious futures, life and immortality, hope and despair…and the link between one village and the shadowy enterprise involved with it.