Daphne in the Brilliant Blue (光と水のダフネ, Hikari to Mizu no Dafune) is a Japanese media franchise. The anime was animated by the studio J.C.Staff, produced by GENCO, broadcasted in 2004, and licensed by Geneon USA before Sentai Filmworks. The anime's prequel manga entitled I - Daphne in the Brilliant Blue (アイ〜光と水のダフネ〜, Ai ~Hikari to Mizu no Dafune~) was drawn by Satoshi Shiki titled and serialized on Young King OURs magazine.
Due to global warming in the future, water has covered much of the Earth due to the effects of global warming. The orphaned Maia Mizuki just graduated from middle school and is one of the few applicable for employment in the elite paramilitary Ocean Agency, part of the futuristic world government.
But her ideal life quickly falls apart. To her disappointment, Maia unexpectedly fails her entrance exams despite her high grades. Making matters worse, she promptly gets evicted from her house, pick pocketed, taken hostage, then shot. She is "saved" by two women (Rena and Shizuka) that are part of an unorthodox help-for-hire organization called Nereids (inspired by the Greek mythological Nereids ). With nowhere to go, Maia joins up with Nereids, taking jobs from capturing wanted criminals to chasing stray cats, often with unexpected results.