Emilia and Caterina write letters that they will never send, after a common adolescence spent in a girls' boarding school. The days passed monotonously and identically, except at night, when Emilia and Caterina met, far from the gaze of their companions and the surrounding world, to discover themselves in each other's bodies.

The two women, now distant, imagine writing to each other to be honest, recover the past and reconcile with saying goodbye to that first love.