In 1974, WWII officer Hiroo Onda made international headlines when he emerged from the Philippine jungle, claiming to not know the war was over. He was returned to Japan and hailed as a national hero. After learning of her family connection to this bizarre story, Filipino-Australian filmmaker Mia embarks on a journey, spanning decades, to meet Onoda. What she discovers is the untold stories from her own family about this so called hero they knew as "the devil of the mountains."