Warble is a small yellow warbler who lives on the beautiful island of Icyland, where he pursues his hobby of human watching. But on a warm day, a deep fog rolls in and obscures his view. The rest of the birds don't seem to notice the fog or the other changes Warble observes on the island. The more the fog is ignored, the more it spreads. When a Red-hooded Spectacled young girl appears, Warble discovers that he's not the only one who notices the fog.