A huge iron ball falls near the Shibuya Scramble crossing ! Help 250 or 3 people! ?? Suddenly, a mysterious group called "Echika Academy" appears with the next-generation AI Nanatarou in front of F-run college graduate freeter Hino . They say that their purpose is to "cultivate" AI ethics (Echika), and Hino says that if he helps either 250 people or 3 people in the Echika project = Shibuya iron ball fall accident, which one will help? You have to make the choice! That choice determines the reality--! Which would you choose if the "trolley problem" actually occurred ? The ultimate ethics game that poses an overwhelming dilemma , opening here!