In an alternate 21st century, Japan emerges as the global leader in robotics, sparking controversy as technology integrates with the human body. Following a UN ban on further research, Japan retreats into isolation, prompting suspicions of hidden advancements. SWORD, an American tech agency, sends a team to uncover Japan's secrets. Vexille, an experienced agent, delves into Japan's mysterious decade-long isolation, revealing unsettling truths.