In the world of the 2030s, the stage of this work, a huge organization called the "Western European Zaibatsu" uses financial and military power to conduct thorough resource management on a global scale, so technology and human progress are stagnant. Therefore, on the surface, technology has not changed since the 2000s. The world view of this work is consistent with the basic setting of the world view common to many TYPE-MOON works, but it is a parallel world derived from the 1970s of the common world view of many TYPE-MOON works, and it is not simply the future of works such as Tsukihime and Fate. In this world, the magic power (Mana) of the great source has been exhausted. Therefore, the "magic (Magi)" and "magus (Magus)" in the common world view of many TYPE-MOON works have almost declined, and the magic association only has the "Atlas Institute" which does not rely much on magic power.