In 2007, Castaldi’s Io e Te was chosen as “Debut of the Month” by the magazine Scuola di Fumetto, and in 2008 he went on to publish Non Troppo Lontano, a historical graphic novel dealing with the Milanese anti-fascist resistance movement of 1943-45. Castaldi also collaborated with Edizione Voilier to publish a two-volume graphic novel, Nuvole Rapide. In 2011, he wrote and illustrated Etenesh, the Odyssey of a Migrant, published by BeccoGiallo.