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In an unspecified future year, long after global warming has inundated the world, a young girl named Maia Mizuki is expecting to get a job at the prestigious Oceans Agency. She's an obvious shoo-in for one of the limited number of positions available, having passed the grueling qualifying exam (which is offered only once a year) with flying colors. But she is inexplicably rejected and within days finds herself not only jobless but homeless, too. An amnesiac orphan whose only living relative, her grandfather, died shortly before, Maia has no one to turn to, and faster than she can comprehend she finds herself stumbling penniless (thanks to a pickpocket) through the seedier side of the city she's lived in all her life. And just when it seems like things can't get worse, a criminal takes her hostage and she is shot by the women chasing him.Maia comes to some hours later on the couch of Nereids ("Neres" in the original Japanese), a troubleshooting agency which is staffed by the women. Manipulated into helping with their case against the criminal and her brother, Maia shows quick wit and ingenuity in the field and soon finds herself offered both a job and a place to live at Nereids. Although her days seem to alternate between boring scut work and life-threatening danger, and her coworkers are often rude and volatile, Maia (to her surprise) starts to find a certain satisfaction in her job — although she is intent on reapplying to the Oceans Agency when the next set of positions open up in a year's time.When a company vacation to tropical Siberia Island seems to awaken memories she had thought forever lost, Maia begins to wonder what secrets her forgotten past holds, and what they may do to her hopes for the future.
This show provides examples of:
After the End: The story takes place after the world's been flooded. Only five or so cities exist.
Doorstop Baby: Left on Yu's doorstep. By Gloria's sister so she could have a break. The baby returns at the end of the episode.
The Dulcinea Effect: Gender flipped. Shizuka finds a guy injuried near trash cans and quickly becomes attached to and protective of him. The guy's a con artist and calls this his 'lonely engimatic spy routine'.
Flashback to Catchphrase (In the eleventh episode, showing Maia's recovery from her amnesia, her grandfather recites the "tree near the water" incantation when she's upset about her lack of progress recovering.)
Flung Clothing: Yu is shown in the opening credits literally ripping her outer clothing off to reveal her "work clothes".)
"Freaky Friday" Flip Gloria and Maia, in one of the Omake episodes due to a mechanical problem. Maia is left holding the bag of bad deeds while Gloria exploits Maia woobie status to seduce a guy.
Government Conspiracy: Maia is from a city that was sealed off by the other cities by stationing submarines at the gates and shoting anyone coming out. It was because of a plague outbreak they didn't want to spread to other cities. Afterwards they said it merely 'failed to surface'. Maia could reveal the truth if she recovered her memories and this would be 'embarrasing' so they make her life shit.
Hair Colors (Shizuka's purple; Rena's red and Gloria's blonde may well be "real".)
The Heart: Maia is the emotional center of the group.
Here We Go Again Subverted: In the last minutes of the last episode, we see the Ocean Agency exam held a year after the one that started the series; a girl who appears to be Maia with the same applicant number clocks in with as good a score on the field exercise as Maia had a year previously — but the moment she reports in, we can see it's someone else entirely, and Tsukasa subsequently worries about Maia making the application deadline.
Holographic Terminal (Desktop and larger systems all seem to use projected screens rather than physical ones.)
Homage (The two-part episode "Die Hard, Play Hard" manages to blend homages to both Die Hard and, weirdly enough, gonzo disaster movie parody Airplane!!)
Idiosyncratic Episode Naming (Many episode titles are plays on the names of famous movies or literary works: "The Old Kook and the Sea", "Anger's Aweigh", "Die Hard, Play Hard", "Five Heavily Armed Women and a Baby".
The Lancer: Yu's the most loyal to Rena and the one most likely to be in charge after her. Also, she tends to work alone when not forced to work with Gloria. She fights with her fits instead of guile or cunning.
The Leader: Rena is the defacto leader of the group.
Limited Wardrobe Almost every character who appears in more than one scene. Oddly, minor character Tsukasa seems to have a realistically diverse wardrobe. Even more oddly, the contents of Maia's closet are shown to be extensive and widely varied — but she only ever wears either the Nereids Battle Bikini or a somewhat formal-looking pink-and-white dress — or both at once.
Suspended AnimationMaia and her big brother when they escaped their home in the backstory. The former was in statis for sixty years.
There Are No Therapists Averted — we see a pair of psychologists who work with the young amnesiac Maia for two years. Then again, they are part of the conspiracy trying to ensure that Maia's memory never comes back.
True Companions: No matter how much grief Nereids gives Maia, they care about her deep down. Milly and Tsukasa even more so because they don't give her such grief.
Underwater City They play an important role in the backstory of the world of the series. In Maia's backstory, as well. She's from there and is one of two survivors.
Unusually Uninteresting Sight: Nobody ever seems to notice the extremely skimpy outfits the Nereids wear while on the job. Possibly justified by the fact that the cities all have tropical climates where it's summer all year; skimpy clothing is presumably common (although we never see anyone else in clothes quite that skimpy...).