Rio de Janeiro, Barra da Tijuca. An anxious and introverted young man will meet his dreamer and down-to-earth girlfriend, on a day they decided to kill class to go to the beach together. But instead of enjoying each other's company, She and He live the most disturbing afternoon of their relationship due to the concern with six months in the future: when she will move to Paris to study and pursue her dream of being a writer. Filled with discussions, secrets and surprises, this is the day when they will realize that nothing lasts forever and that there is no permanence that is not made up of infinite changes, like the movement of the waves in the sea, the matter of our body and all cosmic nature - including relationships.