Lorenzo, a 12 years old boy is bullied everyday by a bunch of boys at the bus stop. They threaten him and ask him money constantly. These boys are part of a little gang 'The shark's mouth' who will soon clash with another little gang, 'The bulldogs'. Beside these two gangs, who are trying to mark their territories outside the junior high school, there are many other characters involved in different events: the little girls and their theatre event, the younger brothers and sisters of the gang's leaders and especially four nice friends who try two help Lorenzo and change the shape of things to come, while starting to feel the first heartbeats for their classroom mates...