The story follows Yuki and her father, who is a writer, as they move to Yamijima Island with her younger brother Hideo. The island has a strange history (like the fact that it was an American burial ground before the war), and a large metal tower can be seen standing on its highest peak. On arrival, she finds the residents to be slightly bizarre. She is even more perplexed when a neighbour offers her advice about the rules of the island. One warning that all the locals rigidly obey is: Never go outside when the air-raid sirens are sounding.

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