Even if you know that "someone else will die in exchange for you being saved," would you choose the path where you are saved? The Organ Lottery, the Trolley Problem, the Plank of Carneades……. "Thought Experiments" that seek answers to questions with no right answer. What the girl Maria created is an "Experimental Grounds" that reproduces these thought experiments in reality. There, people are forced to make cruel choices――! Watching the ending chosen after agonizing struggle, Maria laughs and whispers: "This is what you chose, isn't it?" A noir suspense story that gouges out the essence of humanity!