A devastating meditation on the human cost of war, this animated tale follows Seita (Tsutomu Tatsumi), a teenager charged with the care of his younger sister, Setsuko (Ayano Shiraishi), after an American firebombing during World War II separates the two children from their parents. Their tale of survival is as heartbreaking as it is true to life. The siblings rely completely on each other and struggle against all odds to stay together and stay alive.