Den åldrade Terje ser ut över det stormande havet och minns sin ungdom som sjöman ute på havet, oförväget klättrande i tackel och rår -- och lyckligt gift med hustru och ett litet barn och en nätt liten stuga vid stranden. Plötsligt bryts idyllen sönder av kriget 1809 och engelsmännens blockad av kusten. Oroliga samlas man i grupper, en gudstjänst hålls i det fria. Frågan är hur man ska kunna skaffa mat till hustrur och barn.
By 2039, global warming had caused sea levels to rise and large amount of territory to be lost. As though in response, a mysterious group of warships clad in mist, “the Fleet of Mist,” appeared in every corner of the ocean, and began attacking human ships. In spite of humanity mustering all their strength, they were utterly defeated by the Mist's overwhelming force. All of humanity's trade routes were blockaded by the Fleet of Mist, their political economy was destroyed, and the human race was steadily beaten down. Seven years later, the Fleet of Mist's submarine I-401 appears before cadet Gunzo Chihaya. The humanoid life form that pilots the sub, who should be their enemy, is instead offering her services to mankind.
