Harmony

 In the future, utopia has finally been achieved thanks to medical nanotechnology and a powerful ethic of social welfare and mutual consideration.

This utopia isn't perfect, and three young girls stand up to totalitarian kindness and super-medicine by attempting suicide via starvation. It doesn't work, but one of the girls—Tuan Kirie—grows up to be a member of the World Health Organization. As a crisis threatens the harmony of the new world, Tuan rediscovers another member of her suicide pact, and together they must help save the planet...from itself.

(Source: Viz Media)