In the not-too-distant future, humanity is minding its own business when a huge alien spacecraft suddenly makes a crash-landing in Tokyo Bay. Its passengers look very much like humans, with a few key differences: The vast majority of them are incredibly beautiful young females, and they all wear large, distinctive collars around their necks. While they appear to "come in peace", their nature and origins are a mystery they don't seem eager to reveal. Lacking the knowledge to repair their ship, they decide to integrate into human society through a government-funded "home stay" program, picking up human languages and customs with surprising speed. Their eternally friendly, helpful, and accommodating nature earns them the nickname "DearS".One year later, Ordinary High-School Student Takeya Ikuhara is still suspicious of the alien "invaders", though most of his friends are infatuated with them. Walking home one afternoon, Takeya notices a girl huddled under a blanket at the side of the road, on the verge of collapsing from hunger. Taking pity on her, he carries the strange girl back to his apartment, only to discover that she is one of the very aliens he so distrusts. But "Ren", as Takeya nicknames her, is no ordinary DearS: She seems completely oblivious to even the most fundamental human customs (e.g. wearing clothes), and she eagerly explains to anyone who will listen that Takeya is now her "master", and she is his "slave".As more and more characters (both human and alien) take an interest in Ren and her "master", it looks increasingly unlikely that Takeya will ever get his life back to normal. It's up to him to figure out just why Ren is so different from the other DearS, and make a tough decision on whether he even wants Ren in his life at all.So in short, Alien Nation as a romance manga with Newcomers wanting to be slaves.Based on the manga by Peach Pit and adapted into an anime, licensed by Geneon and relicensed by Discotek Media.
Tropes in DearS include:
Above the Influence — Ren explicitly offers to have sex with Takeya when he starts to feel turned on by her presence. Yet, because she's an alien and (primarily) because he feels that Ren isn't really doing it out of love, he politely (for him, anyway) declines.
An Aesop: The story has a really unsubtle moral that boils down to "love only happens if you aren't trying so hard for it to happen."
Anime Hair — Ren and Miu, Miu's being especially noticeable in her bath scenes. That much hair should not be possible. Could be justified in that they're not human and they're genetically created for beauty. Something in their genes could be for 'impossible hair'.
China shows this a bit at times, but not quite to Nia's level.
Babies Ever After: In the final chapter we learn that not only does this occur, it was always supposed to be that way because Ren is The Gate, and was the only Dears from the ship with the ability to reproduce.
The Casanova — The minor character Hirofuni recurs often enough to provide a contrast to Takeya, always with a girl who can't resist having 'coffee' with him. Though he attempts to seduce Ren, and later gracefully concedes, he winds up the focus of Xaki's attention.
Clingy Jealous Girl — Miu, who seems a little bit jealous that Ren already has a master despite being "defective". Takeya's sister Natsuki also doesn't like it when she first finds out about his "relationship" with Ren.
Closet Sublet — Ren takes to staying in Takeya's closet, since sleeping there was, technically, the first order given to her. She even has a bed set up there.
Any other DearS that temporarily stays with Takeya usually sleeps in the bottom half under Ren.
Cloudcuckoolander — Nia. She claims to be hunting for Ren, but then almost immediately forgets about it for various reasons.
Comic Sutra: In episode 9.5, Miu heads over to Takeya's house to check in on Ren, only to find her "Watching porn to study Takeya's preferences in the earthling ways of sex."
Ren:Holy cow, that looks pretty complicated...
Miu:IS SHE SPINNING!?
Compressed Adaptation — The anime more or less takes a chainsaw to the sci-fi plot and turns it into a straight romantic comedy.
Continuity Cameo — China pops up in the last episode of the anime to say hi on a TV screen.
Dancing Theme — The ED. All the main girls in the cast are doing very simple dancing, but it qualifies since that's ALL that they're doing.
Deconstruction: Two of them. One is of the concept of a slave race, which the DearS set themselves up to be, and the reasons why are rather disturbing. The other, somewhat less serious one is Mitsuka-sensei, a deconstruction of the Hot for Teacher trope. She is, objectively speaking, good looking, but in both the anime and manga she takes hitting on her own students so far even the hormone addled males find her to be Fetish Retardant, and it's heavily implied that she might actually get somewhere if she wasn't trying so hard.
Double Standard: Abuse, Female on Male — Takeya's sister Natsuki cannot stand it when she finds out that Ren and Takeya are living together. While she's implying using physical force or wrestling moves on Ren, she actually does it to Takeya instead. Apparently Natsuki learned it from their mother, who also punishes her similarly from time to time.
Even the Girls Want Her — Ren. Subtext plus Skinship Grope with Neneko, subtext plus opening-credits kiss with Miu, and explicitly the case with Mitsuka-sensei. ("I don't care if you're a girl, that body was made for love!") Also, she gets several fangirls at school who constantly urge her to leave Takeya and hang out with them instead.
Happiness in Slavery — Unbeknownst to humanity at large, the DearS are a genetically engineered "slave race". By design, they are uncomfortable with making their own decisions, and derive happiness solely from satisfying the needs of their masters, a task to which they are selflessly dedicated. They hide their true nature to avoid angering their new human "masters", since they have determined that most humans abhor the concept of slavery.
Harem Nanny — Neneko. Unlike most Harem Nannies, however, she is very much a potential love interest, and while she's the most mature of the cast, she's not above a bit of Tsundere behavior from time to time.
Healing Hands — As Miu explains, it's more a transferring of life force.
Hot for Student — Subverted: Mitsuka-sensei acts in defiance of school rules and decency in her constant attempts to come on to her students, but they find her annoying and embarrassing, frequently wondering aloud how on earth she manages to keep her job.
Human Aliens — The DearS, most of whom could be mistaken for unusually good-looking humans were it not for their collars. In a flashback provided by Miu, the unnamed alien race that created the DearS also appears to be outwardly identical to humans.
Also an example of Clothes Make the Superman: The suits contain a powerful "gravity manipulation device", allowing for effortless Telekinesis and Flight (though these are only used when absolutely necessary). Presumably this is also the source of the DearS' healing powers. When not needed, the suits turn into Pure Energy and are stored inside the DearS' collars.
While the clothes do turn into energy for storage (depending on the anime or the manga, the clothes either swap completely or it only affects the standard latex suit, requiring a change of normal clothes anyway), the forehead crystal are responsible for controlling the DearS' gravity manipulation, as well as other abilities not further mentioned (although it is active during the time that Ren learns Japanese). Wearing the latex outfit is not required.
Lethal Chef — Ren's cooking was so bad that any humans who ate it cried tears of blood. Apparently, however, other DearS (or, at the very least, Miu) find it to be heavenly. Ren's cooking does improve... sort of.
Likes Older Women — Takeya, or at least he's mercilessly teased about being one after Ren blurts out the contents of his Porn Stash to his classroom.
Man Child — Let's face it, Takeya couldn't even survive without Neneko and Ren's help, and not just because the rent's good. One might say that the whole series displays him being dragged kicking and screaming into adulthood.
Pet the Dog: Mitsuka, at one point in the manga, takes a brief break from her usual pervy ways to fashion a swimsuit (a decent one, at that) for the youngest DearS so she can have fun swimming like everyone else.
Polyamory: By default, Takeya literally ends up with all the DearS who decided to return to space.
Porn Stash — Takeya works at a video rental store, which allows him to secretly swipe the latest adult releases, "renting them out" to his friends. A more typical example happens when Ren finds one of these videos beneath the kitchen sink and proceeds to watch it for "research" on Earth sex.
What Is This Thing You Call Love? — When they first come to earth, its believed the DearS are incapable of feeling love or knowing what it is. Later, when Ren and Miu fall in love with Takeya, its revealed that Ren changed the DearS so they could feel love.
You Are Number Six — The DearS' Overly Long Names are actually identification numbers, expressed in their native language. Few DearS seem to have true "names" that aren't shortened versions of their numbers.