Lux International

This is about a top-secret organization called Lux International. Every ten years Travelers go and search for the best candidates to be the new princesses at Lux. Each country of the world has one princess whose job is so help change the world by fixing problems on a small scale - one by one, until there's a snowball effect. There is also a rival secret organization: Nightshade, which consists of only guys who are recruited to mess up the good the princesses are trying to do, and cause more evil in the world. Although friendship relations of any kind are forbidden between the two societies, a boy from Nightshade starts falling in love with a princess.