Set in contemporary Madrid, the story is described as an "urban love story told at cannon blast". It follows the lives of two people from opposite ends of the social and emotional spectrum:

A young man living in a room in Lavapiés , struggling with frustrated aspirations. He ends up suplanting the identity of a food delivery driver named Nicolás . Key Themes

The title refers to the novel (The Coming Together of the Cactus Woman and the Balloon Man), which is the literary debut of David Martínez Álvarez , the Spanish artist widely known as Rayden .

The novel is a tribute to those who are different and "improbable". It explores how two seemingly incompatible people—a "cactus" and a "balloon"—can manage to close the gap between them without destroying one another.