In the future, Utopia is finally realized through medical nanotechnology and a strong ethic of social welfare and mutual consideration. However, this perfect world is not entirely flawless, as three young girls rebel against totalitarian kindness and super-medicine by attempting suicide through starvation. The attempt fails, but one of the girls, Tuan Kirie, eventually grows up to become a member of the World Health Organization. As a crisis threatens the harmony of this new world, Tuan reconnects with another member of her suicide pact, and together they must help save the planet... from itself.