Is there a certain age to fall in love? Nanito offers a captivating answer: the heart never gives up. The film tells the story of Nanito, an 80-year-old man who decides to win back Antonia, an old flame. Her innocence and her antics invite the audience to laugh, be moved, and reconsider preconceived ideas about love in old age.

Accompany Osvaldo, "El Mariana", on an intimate six-month journey as he prepares for his fight at La Velada del Año 4, at the Santiago Bernabéu stadium in Madrid. Through his training, we not only see him face physical and emotional challenges, but also discover new facets of himself, where his public and personal lives become deeply intertwined.