Guglielmo (aka Nebbia - Fog) has just moved to Milan where he does his level best to eke out a living. He makes friends with a group of social misfits called Tetra, Nico, Franco and Monica. Guglielmo, a sort of idiot-savant, is never judgemental and manages to find beauty and poetry in even the most insignificant events. He writes his verses on the city's walls. It is almost as though Guglielmo were a compassionate and forgiving angel come to Earth.