The protagonist, Touya Kagari, is a resident of Shin Yokozaki City and a sophomore at the prestigious Hakuou North Academy. An earnest and responsible young man, Touya appears to be no more than your average high school student. While returning from his part-time job, he heard a mysterious sound coming from the depths of the Restricted Ward, an area off-limits to unauthorized personnel due to a horrible disaster that happened there ten years ago. His curiosity having gotten the best of him, Touya ventured ever deeper into the ruins of the ward, eventually coming across a man who appeared to be gravely injured. Concerned, Touya rushed to his side, asking if he was okay and if he needed any help.