Agent Aika (or AIKa) is both the Ultimate Panty Shot Vehicle and definitive proof that Most Writers Are Male. There is also some plot - and it's surprisingly amusing.Twenty Minutes into the Future, the Earth has been ruined due to global warming; lots of places are now submerged deep under the sea. Enter Aika Sumeragi, a beautiful woman who works as a "Salvager" (scuba-divers hunting for valuables under the water) in a little family-owned company managed by the father-daughter team of Gonzo and Rion Anda. Since Gonzo's policy of good service for a low price manages to drive the company to bankruptcy, he decides to accept a high-paying mission: finding a material named Lagu (known in the Latin American subtitles as "Ragg").After recovering the Lagu, Aika and Rion are captured by an oversexed White Hair, Black Heart man named Hagen, who wants the Lagu so that he can bring about The End of the World as We Know It and repopulate the planet with his own descendants; to that end, he has created an army of scantily-clad and skilled women called the Delmo.Aika has a secret, though: when she was younger, she was the victim of some nasty experiments, and as a result, she possesses a SuperCorset that transforms her into a super-powered version of herself (that is all but naked). When Hagen discovers Aika's secret, he thinks she will do fine in his harem. After Aika rejects the prospect, she takes it upon herself to find a way to defeat Hagen, his even more disturbing sister, and his entire army; with the help of Rion, Gust (a salvager who has a crush on Aika), and the enigmatic spy Miss Maypia, Aika ends up saving the world and stopping Hagen's plans.That's what happens in the first four OVA episodes; after these episodes proved popular, three more were created to capitalize on the success. In the last three episodes, the Delmo army—deprived of any reason for existence following Hagen's death—turn their attention towards Aika. They want to discover her secret and defeat her at all costs, and they will use any method they need—including loli-looking doctors and Bifauxnens—to accomplish the task.There are two new series of OVA, Prequels where Aika is a teenager, called AIKa R-16: Virgin Mission and AIKa ZERO.Najica Blitz Tactics — by the same director of Aika/AIKa 16 (Katsuhiko Nishijima) and the same studio behind all of the Aika OVAs (Fantasia) — has totally different characters and a wholly different plot, but for the most part displays the same level of Fanservice that Aika does.
Other than that, characters like Rion (towards Aika) are pretty ambiguous. The OVA's then have Eri who is obviously gay, but may be in the closet, toward Karen-senpai who herself is very ambiguous. Then there is pretty much every bad girl in the second OVA except the Big Bad and The Dragon who are obviously into each other.
In a somewhat surprising aversion for a fanservice series, Aika makes unambiguously clear she is not atracted by girls with her reaction to Pierre Valimore (a.k.a. Valarie) and to Eri's antics in the OVAs'
Anti-Villain: With exception to Nina and Hagen, pretty much everyone else isn't really a bad guy, especially in the OVA's.
Heroic Sacrifice: The Big Bad in the Second OVA series, saves her dragon by taking a spear of light up the you-know-what. Luckly, despite it looking otherwise both are fine. and even get a happily ever after.
Lipstick Lesbian: From the original series there is the two head white delmos, the long green haired one and short gray haired one, and the second OVA has the big bad and her dragon. Eri from the OVA's and Rion from the Original's are this but the object of their affections, Karen-sempai and Aika, are Ambiguously Gay and not at all, respectively.
Market-Based Title that develops into Title Confusion: The original title in Japanese is just AIKa (yep, that's how it's romanized), but for the English market it was retitled "Agent Aika", which is weird since Aika is not described as an "agent" of any sort.
This probably comes from the fact that the first episode of the OVA is titled "Beautiful Agent". (Yes, "eejiento" in katakana.)
Meaningful Name: "Delmo" (romanji Derumo) is an anagram of "model" (romanji moderu), as in "fashion model". Don't let the initial connotations fool you, however.
Paid Harem: Hagen wants to "cleanse the world from the unworthy" using the Lagu, and "repopulate it with the Delmos' assistance", and he offers the captive Rion a chance to "help" him in this endeavour. Needless to say, she tells him in no uncertain terms that she does not appreciate the "offer" at all. With a good deal of unladylike swearing and cursing.
Panty Shot: Do NOT make a drinking game out of panty shots if you are adverse to alcohol poisoning.
Hagen deliberately has the Captain's chair on his ship's bridge on a considerably lower elevation than the rest of the room, to give a perfect view of every single passing Delmo's underwear.
Pet the Dog: Hagen has one in the second OVA, after capturing The Big Bad and Dragon, the end credits show he eventually let them go after studying their abilities and they are shown happily living together.
Phlebotinum Breakdown: Aika's transformed state has its' limits, and will revert to corset-form to recharge when it's energy is depleted. This can take hours or days, depending on the energy drain. If it's really low on energy, it will compress into a small black ball.
What Measure Is a Mook?: Averted and defied. The Delmos Commander takes proper steps to ensure proper full evacuation of her crew twice. Also, her motivation for taking revenge as well as the motivation of Valarie to act as "Pierre Valimore" is to avenge the Delmos mooks that got pretty mauled in the previous battle.