A teenage boy, who could be anyone (regardless of age), decides—at his own request—to reread his diary, searching for answers without having asked any questions yet. The diary contains accounts of his relationship with Marta, his former girlfriend, and with his best friend, Alma. What would happen if the past resurfaced and could alter the future? What if the question and the answer arrived simultaneously? What if a drop of sadness fell from the sky on a cloudless, rainy day?