In the future, Utopia has finally been achieved thanks to medical nanotechnology and a powerful ethic of social welfare and mutual consideration. This perfect world isn’t that perfect though, 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.

When mysterious foreign entrepreneurs appear with the intention of tearing down Treasure Town and replacing it with an amusement park, Black and White face their greatest adversaries yet. It is up to the destructive Black to save the fate of the city and up to the gentle White to save Black from his own dark nature. On the street of an unnamed city, literally high-flying urchins Black and White look to protect their turf from invasion from other gangs. While he can be tough in a fight or wielding a weapon, White is an 11-year-old who can’t even dress himself. Slightly older, Black is more worldly and treats his buddy with paternal love. Both look on their city as “our town.” Also prone to seeing the city as his property is world-weary yakuza leader Suzuki, aka the Rat. Feeling the town has become too placid, Suzuki plots his return, much to the consternation of local police.