The story is set in 1963 in Yokohama . Kokuriko Manor sits on a hill overlooking the harbour . A 16 year - old girl , Umi , lives in that house . Every morning she raises a signal flag facing the sea . The flag means ' I pray for safe voyages "...
The movie begins with a war galley caught in a storm at sea. The ship's weatherworker is distressed to realize that he has lost the power to control the wind and waves, but is even more disturbed when he observes two dragons fighting above the clouds...