The year is 2048. An era where highly advanced artificial intelligence supports every sector of society. People follow the judgments of AI, crime has decreased, and life has become more convenient than ever before. However, behind the facade of this perfect society, a series of inexplicable incidents have been occurring. One day, a man appears before you. His name is Nichi. A person with calm analytical skills and sharp insight, he harbors doubts about the conclusions drawn by the AI. "This case just doesn't sit right with me. The AI's analysis is too perfect. But as long as humans are involved, can such a thing really be possible?" He hands you the case files. It is a mysterious case that the AI has already judged as resolved. The investigation by the two of you will eventually lead to a massive mystery that shakes the very foundations of society.