The fog

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