The world is not in balance, and a distant conflict between industry and nature has wounded one of the gods of the forest, which is then killed by a sentry boy as it rampages into farmland he guards.
It is set in an imaginary time which blends the time of the ancient gods (Shinto style, gods of place and nature) with the settlement of humans and the coming of metalworking and war. This seems to be Miyazake's most personal work, clearly a serious design.