In a future where Utopia has been realized through advanced medical nanotechnology and a strong commitment to social welfare and mutual care, the world seems flawless. However, this ideal society has its flaws. Three young girls rebel against the oppressive kindness and advanced medicine by trying to end their lives through starvation. Their attempt fails, but one of them, Tuan Kirie, eventually becomes part of the World Health Organization. As a new crisis endangers the world’s harmony, Tuan reconnects with another member of their past suicide pact, and together, they must work to rescue the planet from its own perils.