Anna and Matteo are on their way to a family meal, like every Sunday. But in Anna's head, things are boiling, she can't help but imagine another reality... so far from her own. Today, without warning, everything explodes. A hand brushes against her, a look seduces her. Anna discovers a world she doesn't know. A world to get lost in? “The Theory of Y” explores today’s desires and loves with humor and delicacy.