On an idyllic island where humans and fish coexist on land, young Iode (short for Iodine) waits patiently for a letter he has been expecting, one that seems to be perpetually delayed. Suspecting it might have gotten lost, he takes a trip into town to inquire at the post office. Along the way he meets a spirited hitchhiker who has been entrusted to deliver a mysterious package by the enigmatic underworld syndicate, 'The Octopus.' Their two missions intertwine leading not only to unexpected adventure, but deep personal realizations for both of them... The world is not what it seems, and the simple surreality of their little town may not be everything it seems to be.