The Japan Maritime Self-Defense Force has recently released images of its cutting-edge electromagnetic railgun, developed by the Acquisition, Technology, and Logistics Agency (ATLA). This innovative weapon is designed to counter the threat posed by hypersonic missiles. Although the concept of electromagnetic gun technology dates back to the 1920s and may sound like science fiction, the underlying principle is actually quite straightforward. In theory, even engineering students could construct a basic electromagnetic gun without much difficulty. However, the railgun showcased by Japan has undergone significant improvements, incorporating practical features such as turret rotation and barrel elevation. Nevertheless, it is still a few steps away from widespread practical application. Japan aims to persist in research and development over the coming years, with the ultimate goal of achieving the miniaturization and operational deployment of electromagnetic guns.