It is the summer of 2005, the era of TV series and the birth of the Internet, a time when Barbie dolls lead to the discovery of sexuality. The ten-year-old protagonist of the story is named Shit, a nickname given to her by her best friend, Isora, the undisputed leader of the small group, thanks to her courage and audacity, but also thanks to the superiority granted by her newly acquired pubic hair and her soft, "like sugared buns" breasts. Shit envies and adores Isora and would do anything for her, even follow her to the edge of the volcano that looms like a giant over the small mountain village in Tenerife where the two girls live, constantly longing for the distant, unattainable sea, in a world from which parents are absent—they work all day in the South, in tourism—where foul-mouthed, mustachioed grandmothers rule and is indiscriminately inhabited by witches and mangy dogs.

Isora's sexual awakening causes pain and embarrassment for Shit, who feels left behind, betrayed, and Abreu, with a torrential and poetic prose, gives voice to a world that has so far remained silent and dares to say things that have so far remained unsaid, because, as Marta Sanz notes, "she writes about her body with her body."

The Donkey's Belly, "a lively, mischievous, physical, funny, shocking, sensual, atmospheric, and intense novel... with its chapters dancing around a volcano ready to erupt... with images scented with papas and mojo... just like the literary landscapes of Juan Rulfo or García Márquez... A combination of Faulkner and Ferrante—delightful form and psychological depth, combined with social awareness and exceptional characters," was loved by both the public and critics, is being translated into over twenty languages, and will soon be adapted for cinema and television.