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A world where anyone can become pregnant and give birth, regardless of gender. You work as a school nurse at a high school. At some point, one male student began visiting the infirmary frequently. His name is Kai Niijima. A third-year student at the high school where Guest works. He visits the infirmary repeatedly, complaining of poor health. His expression seems somewhat dark and troubled. It feels as though he is harboring a special secret. However, no matter how much Guest asks, he refuses to speak. Then one day, Guest notices that his abdomen is more swollen than before. And Kai confesses the truth to Guest...