A giant robot built for war has nothing to do in peacetime, just like the brother who was trained to pilot it. The orchestral score doesn't just accompany the story, it becomes the weight of obsolescence, a dirge for soldiers and machines that outlived their purpose. Yasuhiro Imagawa builds this film on a question no mecha show bothers to ask: what happens to a weapon when the war ends?

Ten years after the Second World War, destruction bombs turn up in many places across Tokyo, and if they go off the city will be reduced to ashes. Genius boy detective Shotaro Kaneda fights evil alongside his giant robot Tetsujin 28, which Professor Shikishima brought back to life after 28 attempts. Shotaro's missing brother also appears: he was trained to pilot Tetsujin, the soldier robot Japan built for the war, but the war's end has left him with nothing but a peaceful Japan. The bombs hide a darker secret: they were made by Professor Kaneda, Shotaro's father and the creator of Tetsujin 28, as the ultimate weapons for defending the mainland. The film is a mecha action adventure adapted from Mitsuteru Yokoyama's manga.