This one-act zarzuela written by Jose Rizal in 1880 depicts a debate between a young boy named Leonido and Satan over questions of faith and religion. Leonido defends his Christian faith against Satan's attempts to sway him, arguing that there is only one true God. Though threatened with battle by Satan, Leonido never wavers in his faith. He is ultimately saved from Satan's clutches by the Virgin Mary. The play examines themes of Christianity, innocence against evil, and paganism in a uniquely Philippine context through its characters, setting, and references to local religious traditions.