Big X

During World War II, Dr. Asagumo, a renowned scientist, is invited to Germany by Adolf Hitler to collaborate on the development of a top-secret weapon known as "Big X." As Dr. Asagumo begins working on the project, he becomes increasingly concerned about the potential consequences of its completion. To delay the research, he secretly conspires with his colleague, Dr. Engel, and intentionally slows down the progress of the project. Just as Germany is on the brink of defeat, Dr. Asagumo implants a card containing the secret of Big X in his son, Shigeru, and is then shot to death by the German army. Twenty years later, the card is discovered in Shigeru's body, which has been living in Tokyo. A mysterious organization claiming to be allied with the Nazis emerges, steals the card, and completes the Big X project. The organization's goal is to use Big X to conquer the world. The completed Big X is revealed to be a powerful drug that can expand the human body without any limitations. Shigeru's son, Akira, fearlessly challenges the Nazi Alliance and Hans Engel, who are determined to exploit the power of Big X to achieve their sinister goals. With his father's legacy and the fate of the world hanging in the balance, Akira must confront the dark forces head-on to protect humanity from the dangers of Big X.