Yuria is a Model 100 Dutch Wife (hence the title; 100-shiki means "type 100") — essentially, a Sex Bot. She escapes her inventor's lab (naked, of course). Shunsuke-san finds her on the street (still naked) and offers to let her stay with him for a while. She's programmed for sex, while Shunsuke is blindlydedicated to his ice-coldfiance. Hilarity Ensues.Yuria, being a Dutch Wife, is programmed to have sex at any opportunity. Once she does have sex (specifically, if Tab A is inserted into Slot B), she will be permanently and forever imprinted as a sex slave to the person with whom she has had sex. Problem is, she is a little more self-aware than her creator intended and is able to realize the consequences if she is imprinted, and starts to think maybe she doesn't really want that to happen. She questions her programming and eventually starts wondering if what she feels for Shunsuke is truly love, or if she is really just a preprogrammed robot after all.Each issue is more or less a filler episode (a sexy filler episode) where Hilarity Ensues but sometimes veers back towards Yuria's confusion about life and love. Even though she reaches her conclusion that she doesn't want to be a Dutch Wife within the first few pages ("Dutch Wife!?You mean I won't be protecting the Earth or anything?") her emotional self-awareness as a person continues to grow, even though she inevitably winds up rationalizing trying to have sex with Shunsuke.Oh yeah, it's very ecchi, just in case you haven't already figured that out, almost to the point of hentai. Except that it isn't actually pornographic, what with all the not actually having sex happening on account of nobody wanting to sleep with the people who want to sleep with them.Brought to you by Shigemitsu Harada - the same mangaka who created My Balls.For the same basic story with a gender-swap, see Absolute Boyfriend.
Bluffing the Murderer: Parodied when a bunch of little boys find a photo of a vagina, and manage to bluff Yurin's owner into staring at her crotch and revealing the location of this mysterious hole.
Butt Monkey: Akiba. His creations keep walking out on him as soon as he can turn them on. He consistently fails to ever be able to do anything about it. He repeatedly shows up on TV reports for having been arrested, running around naked, chasing his creations. Because all his later models run away, he's constantly having to resort to carrying around his "Yuria Model 28" — a blow-up doll. (Which still frequently manages to reject him via some sort of malfunction or missing feature.)
Catch Phrase: Lucy says "No Problem!" in English once or twice per chapter.
Cannot Spit It Out: Yuria. Justified, since she's aware that she is a robot, she really doesn't know if she's in love with Shunsuke or if it's just her programming. For the same reason, she never quite gets around to telling him that she's a sex robot, and when she does manage to blurt it out, he thinks it's some kind of strange joke on her part.
When Julia and Yurin decide to "help" Yuria confess, things don't exactly go as planned.
Can't Have Sex, Ever: Yuria, if the alternative is to become a completely subservient sex slave (which is her intention). With all the sex play that ends up happening anyway, this is a pretty lax restriction. According to chapter 22, the exact requirement is three seconds of insertion.
Shunsuke, because he's faithfully devoted to his emotionally distant, entirely chaste girlfriend.
Julia, because her "owner" is underage. Subverted in that, Julia promises to keep herself chaste for him till he completes 18 years old, going as far as foreplay in between.
Yurin, because the person she picks to be her "owner" is not a Lolicon and totally Squicked out by her advances.
For example, when Yuria becomes fascinated with the shampoo she's squirted out all over her hands, the Little Yellow Box explains that the Model 100 Dutch Wife is programmed to be mesmerized by milky white fluids.
Since the Little Yellow Boxes address the reader as if they were advertisements for the Model 100, they do a good job of Painting the Medium
In chapter 27, the boxes turn the tables and focus on Maria, explaining things such as that due to her high class upbringing she does not quite comprehend what a love hotel is.
Gone Horribly Right: It seemed like all of Dr. Akiba's problems with the latest Yuria models was that they had personality, enough to reject him even though they are programed to disregard at least their partner's looks and behavior, so his last creation was Yuria 1000, the most advanced Yuria model, completely devoid of personality and any remarkable trait; in theory it wouldn't reject even him, or so he though... like all Yuria models she still is a Dutch Wife progamed to please men, with her lack of direction Yuria 1000 simply reached the conclusion that she should go randomly around pleasing as many men as she could find, not settling for just one master by giving them quick pleasure and not letting anyone penetrate her. In the end she was just another Yuria that Dr. Akiba couldn't keep in his grasp.
Harem: Yuria gets two "sisters" during the series; a Tsundere and a Loli. At first they both try to also seduce Shunsuke. After Yuria defends her "ownership" of Shunsuke, they each find their own "owner." Lucy and Louie also encounter Shunsuke right away and both decide to make him their first "conquest.". (Although in Louie's case, it seems more like an actual crush and less based on programming.)
Imagine Spot: Yuria often dreams and daydreams about her and Shunsuke being a real couple. Usually devolves into ecchi pretty quickly.
Shunsuke will frequently hear her mumbling in her sleep and imagine she must be having pleasant dreams when she will suddenly blurt out something extremely ecchi.
Incredibly Lame Pun: One chapter includes a scene with Shunsuke and Yuria listening to a radio call-in show where the subject is "What is love." One caller seems to be relating a serious metaphor involving the letters of the alphabet. Until he gets to H. It's a more obvious pun in Japanese than it is in English.
Nose Bleed: Regularly from Shunsuke and Yuria. Especially Yuria.
No Romantic Resolution: Yuria and Yurin have not penetrated by the end of series. The series ends on a clear note in that the connection to their supposed owners are stronger than making them loyal robots through sex; in other words, love and commitment wins over uncompromised sex.
Yuria has been programmed for one purpose. Anything outside her area of expertise leaves her pretty lost as to how to proceed, usually winding up in Deus Sex Machina territory. The serious part of the plot is her trying to learn how to fit in.
Julia and Yurin, despite also being Sex Bots, somehow seem to have a much more practical grasp of everyday life. The fact that they are later, improved models probably has something to do with it. (Julia even has a tendency to call Yuria "the old model" much to Yuria's annoyance.)
Not What It Looks Like: Inverted. Most of the time it is, with Shunsuke trying to come up with a plausible excuse why it isn't.
After only about 55 chapters, and countless "seduction attempts", Shunsuke might be finally getting some kind of vague clue, sort of, possibly.
Only Six Faces: Maria and Yuria have almost the same design, the biggest differences being their hair styles. Because of this, in chapter 21 Yuria was able to pretend to be Maria in a girlfriend contest. There are also many similarities in the designs for most of the recurring male characters.
Ridiculously Human Robots: They look human, they have human-equivalent bodily fluids (which are digestible to humans!), and they can apparently heal from small injuries. On the other hand, their mental capacities are unusually limited for the trope—Yuria can't even count to a hundred.
Sex Bot: All of the named female characters so far except Maria and Louie's roommate Kaoru.
Shapeshifting: In the final volume, Dr. Akiba brings us Yuria 1000 an emotionless dutch wife built with nanotechnology and coated with silicone, capable of taking the form of any female or any of her "sisters" by touching them, turned out to be a failure as she did not have any personality.
Showing Off the New Body: in chapter 83, Yurin eventually learns how to make her body change to that of a grown-up woman, even without her supposed "owner" ever making advances on her and modelling the body after his preferences, with the new form she adopted the alias of Lorin trying to fool Ippei into having sex with her, still she failed as the form can't last long enough.
Sliding Scale of Robot Intelligence: Yuria is convinced that her robot brain must be more than capable of helping a high school student with his tutoring. Turns out, not so much; Akiba must have put "advanced math skills" low on the list of requirements for a Sex Bot.
Super-Powered Robot Meter Maids: Both the Yuria and Lucy series could potentially cause serious damage if they used their full strength. Lucy 3.5 sports a foot long penis that can break through a door.
Maria. She was most likely raised purely and just has a misunderstanding and worry for Shunsuke. She just stabs people with a inch and a half long point extending from her parasol. Otherwise she's so calm it's heartwarming and obvious to see why Shunsuke loves her.
Unusual Euphemism: At one point Yuria says that semen in her mouth are "Tragic Summer Memories". Although no one was supposed to know what it meant.
What Measure Is A Nonhuman: Among other things, whenever someone casually refers to one of the sexbots with a word like "person", the first line of her manual (e.g. "Yuria Type 100 is a dutch wife") appears in an inset panel. Especially common with Julia, whose owner, the doll collector Yoshio, thinks she's his first real human girlfriend.
When All You Have Is a Hammer: Yuria's programming leads her to think everything can be solved by sex. Bleeding wound? Stimulate the penis to draw blood down to it. Lost in the woods? See if you can get Shunsuke's erection to point north.
Even in situations where it seems like she would be useful. For example, rubbing two sticks together to start a fire would be greatly helped with her impressive rate of 16 strokes-per-second (normally meant for... getting other things hot...). No, she just plows on as normal, completely unaware that success would mean setting Shunsuke's genitals on fire.
Wife Husbandry: Model 108's (Yurin) primary selling point is that the owner can mold her body and personality to whatever he wants.
Since this is her program, she is actively trying to get her "owner" to implement the plan on her against his strong protests, so it's actually inverted.
It also seems that, since Ippei wants to be a schoolteacher, what he "wants" Yurin to be is a typical young schoolgirl. And lately Yurin seems to be acting more girlish and less utterly perverted. (Still perverted, but not as much. Mostly.) So now it may be headed to subversion territory.
Xenofiction: Yuria does not think like a human, no matter how much she wants to (which is pretty unusual for a series that asks Do Androids Dream?)
Yaoi Fan Girl: Louie's roommate Kaoru misunderstands the situation, and promises to help Louie make Shunsuke "his" first receiver. (For that matter, Louie herself refers to Kaoru's collection of BL as "a mountain of treasure").