[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/sundome_logo_3347.jpg]]
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-> '''Kurumi:''' I won't have '''sex''' with you. Even if I do it with someone else... or as a casual fling... even if we were the last two people on Earth... I'd still never have '''sex''' with you. No matter how much you cried and begged for me... I'd never let you come. Are you... okay with that?\\
'''Aiba:''' ... yes.

''Sundome'' (''Stopping the Moment Before'') is a {{Seinen}} manga by Kazuto Okada, who also authored ''Manga/KyoukashoNiNai''. It was serialized in ''Young Champion'' from 2006 to 2009.

The main character is Hideo Aiba, who believes that [[AllMenArePerverts all]] [[AllWomenAreLustful humans]] have specific turn-ons and, because of his specific demands, he has never "fallen in love with someone at first sight". Enter NewTransferStudent Kurumi Sahana. She is odd, yet "all of her" is Aiba's turn-on. She gets a seat next to him, and the other students note Aiba's lack of interest in 3D girls. After school, Aiba is a member of the "Roman Club", whose members search for [=UFOs=], paranormal activities and the like. The Roman Club was funded by school alumni now involved in all facets of Japan's politics and economics. Also, every member has a specific fetish and losing your virginity means you get kicked out of the club. For those members who uphold the rule of remaining a virgin until graduation, the alumni supply numerous recommendations and backups for getting into colleges and high-paying careers. However, due to so-called assassins, [[ItMakesSenseInContext women sent by Roman Club alumni to cater to the Club members' fetishes and rob them of their virginities]], six years have passed without a single member successfully graduating. As Aiba tries to get out of his membership, Kurumi shows up, showing an interest in the club. After the other members [[ShuttingUpNow leave]], Kurumi starts reading "The Secret Book of Masturbation", which she found in the club, and asks Aiba, "Show me how you jerk off." This is the start of an unusual relationship.

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!!This manga provides examples of:

* AmIJustAToyToYou: Aiba struggles with feeling used by Kurumi, especially after noticing [[spoiler:the shoes in Kurumi's apartment]].
* AssShove: The ex-president has an anal fetish, is obsessed with sticking things up his and other people's asses, and never misses an opportunity to work "butt", "ass", or "anal" into his dialogue.
* BlandNameProduct: "Adides" shoes.
* BittersweetEnding: [[spoiler:While Aiba and Kurumi get to express their love for each other, Kurumi still passes away and Aiba moves with his life while also holding onto her memory.]]
* CassandraTruth: The Ex-President repeatedly declares that [[spoiler:Kyouko and Kurumi are 'assassins']]. He's only half right.
* CerebusSyndrome: The story begins with typical high school comedy, but gradually shifts more towards the melancholy as [[spoiler:Kurumi's sickness becomes more evident]]. [[WhamEpisode Then comes Collar 72...]]
* CloudCuckoolander: Everyone in the Roman Club has their head firmly in the clouds.
* ContentWarnings: The English volumes are marked with an "Explicit Content" warning befitting their hard {{Ecchi}} content.
* CreepyDoll: Tatsuya's doll that he carries around constantly; he says her hair actually grows.
* CuteLittleFangs: Kyouko has two which are almost constantly seen when her mouth is open, giving her a very vampire-like look.
* TheDitz: Kyouko is generally [[DumbBlonde dumb as a bag of rocks]], although she can be quite canny about some things, especially emotional issues.
* DirtyCoward: Tatsuya will run away from anything that looks remotely dangerous the first chance he gets. PlayedForLaughs.
* DumbassHasAPoint: She gets words mixed up all the time, but Kyouko isn't always wrong.
* {{Ecchi}}: '''Very''' much so; it pushes the boundary between ecchi and {{hentai}} about as far as it can be pushed without crossing over.
* FirstGirlWins: [[spoiler:Subverted, possibly double subverted. The woman that Aiba is with at the end of the manga [[OnlySixFaces does not seem to be Kurumi]], but Aiba has some sort of sexual malfunction at the end, presumably a failure to get an erection. This implies that he never got over Kurumi.]]
* FlowerMotifs: Aiba flips out when [[spoiler:someone leaves a bouquet on Kurumi's desk, implying that she died]]. Additionally, in the final chapter, [[spoiler:Aiba has sex with Kurumi as the 'sea flowers' form on the shore. Kurumi notes that the flowers are made of dead plankton.]]
* GagLips: Katsu has large, fish-like lips, and Kyouko frequently calls him "fish-mouth".
* {{Gonk}}: Katsu, Tatsuya, and the ex-president are generally drawn as quite ugly, and Aiba gets the same treatment when he's scared, sad, or shocked, which happens frequently.
* IdiosyncraticEpisodeNaming: Instead of chapters, we have ''collars'', referring to the "collars" that Aiba believes Kurumi has put on him.
* ImprobableHairstyle: The ex-president's hair makes him look like he has an anvil wrapped around his head when seen face-on.
* ItMakesSenseInContext: Read the part about the 'assassins' again.
* IWantToBeARealMan: Aiba decides to start working out and getting into other activities, partly to get his mind off his sexual frustration and partly to overcome personal issues pointed out by Kurumi.
* JapaneseSchoolClub: The Roman Club is supposed to be focused on finding paranormal events, but often gets sidetracked by the weirdness of its own members.
* {{Jerkass}}: Kyouko's ex, who treats her pretty much as a disposable fuck-puppet and bullies the male club members. He eventually gets his comeuppance and disappears.
* JizzedInMyPants: Shows up frequently, due in large part to Kurumi's control over Aiba.
* {{Malaproper}}: Kyouko is ''constantly'' mangling her sentences, much to Katsu's exasperation.
* MaleGaze: Centered directly on Kurumi and Kyouko.
* ManicPixieDreamGirl: Kurumi, in a very strange fashion.
* MsFanservice: Despite the constant barrage of fanservice provided by Kurumi, in-story it's Kyouko; she is constantly wearing revealing clothing, seems to have never heard of bras, and is much less modest than Kurumi. Kurumi also never wears a bra, but it's Kyouko that makes it obvious to everyone around her.
* MistressAndServantBoy: Aiba and Kurumi have this dynamic, despite being roughly the same age.
* TheMovie: Was adapted into ''four'' live-action movies.
* NerdGlasses: Katsu, although the art only rarely makes this apparent; the googly blank eyes he's usually drawn with feed into his fish-like appearance.
* NoNameGiven: The ex-club president's name is never revealed.
* NotWhatItLooksLike: The older man that's occasionally seen with Kurumi. Many of his scenes give the impression that he's sleeping with Kurumi, especially to Aiba. [[spoiler:Turns out he's one of her doctors making house calls on her, and is very pleased that Kurumi and Aiba have found each other. He's also one of the OB, along with the head of the hospital Kurumi is being treated at.]]
* OnlySaneMan: Aiba and Katsu are very weird in ways, but they're bastions of sanity compared to the ex-president and Tatsuya.
* PetitePride: Aiba isn't interested in busty girls...[[SingleTargetSexuality or any girl other than Kurumi]].
* PowerDynamicsKink: Kurumi and Alba's relationship is like this. She does tell him when and how he can orgasm, but a large part of their relationship is him getting turned on by her controlling him non-sexually.
* ThePromise: Kurumi's declaration to Aiba at the top of the page. Aiba also promises to take Kurumi to see the sea flowers in the spring. [[spoiler:Aiba [[IGaveMyWord keeps his promise]]; Kurumi does not.]]
* ReallyGetsAround: Kyouko, though since she started hanging around the Roman Club, she's toned it down somewhat.
* SceneryCensor: Katsu's fetish
* SingleTargetSexuality: Aiba becomes completely focused on Kurumi once they start hanging out with each other and Kurumi becomes a member of the Roman Club.
* SnowMeansDeath: Collars 73-76 take place in the winter. [[spoiler:Kurumi apparently dies the night that Aiba takes her to see the sea flowers.]]
* ThirdPersonPerson: Kyouko frequently speaks in third person, especially when she's excited or upbeat.
* WhamEpisode: The aforementioned Collar 72, in which [[spoiler:Kurumi mysteriously disappears, leaving the Roman Club wondering what has happened and Aiba bitterly regretful that he didn't do more with her before that point. She comes back in the next collar, but her health has taken a sharp turn for the worse.]]
* WhamLine: [[spoiler:"LittleDidIKnow, that was the last summer I would spend with Kurumi-kun."]] It marks the shift from {{Shonen}} hijinks to the actual {{Seinen}} form that the manga ultimately takes.
* WillTheyOrWontThey:
** Played with. Aiba and Kurumi have a relationship that's fraught with sexual tension and all manner of unconventional expressions of love, but they do have an actual relationship. [[spoiler:Additionally, Kurumi flat out says that she loves Aiba, and Aiba eventually does the same.]] Despite that, there's literal unresolved sexual tension, in that Kurumi controls when Aiba can orgasm.
** The relationship between [[spoiler:Katsu and Kyouko]] slowly builds over the course of the manga, and the one time when it seems like they might, a distraction gets in the way. [[spoiler:In the final 'collar', Aiba's wife reveals that they are getting married.]]

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