After a heated argument with his father, Ikuto Touhohin impulsively decides to flee home. He boards a vessel hoping for a brief escape, but the ship is suddenly struck by an enormous tempest—sending Ikuto into the sea! When he awakens, he discovers he has survived on a deserted island. A remote isle with no infrastructure—no power, gas, radio or TV—only a cluster of beautiful girls. Stranded among them, he finds himself back in a primitive world, forever surrounded by endless sea and silence and the echo of distant gulls in the twilight.