2047年，世界人口突破100亿，人类政府宣布世界医学界研究出能将人口大幅骤减的药物：MERGE。被称为继计划生育政策之后最能有效地控制人口的举措。（In 2047, the world's population exceeded 10 billion, and the human government announced that the world's medical community has developed a drug that can drastically reduce the population: MERGE. It is called the most effective measure to control the population after the family planning policy.）