[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/nyan-koi.jpg]]

Junpei Kousaka is an OrdinaryHighSchoolStudent with an allergy towards cats and a family that loves the little beasties. Life is normal and fairly peaceful for him, right up until the part where he breaks a shrine that housed the Guardian Deity of Cats.

Suddenly, he finds that he can hear cats talk and they can hear him. If he wants to make up for his accident, he must do 100 good deeds for cats, [[KarmicTransformation lest he be turned into one himself]] and possibly die from the full-body allergic reaction.

An anime adaptation of the series aired in the fall of 2009, with the second season announced at the very end of the last episode, but [[DevelopmentHell never heard of ever since]]. ''Manga/NyanKoi'' is licensed by SentaiFilmworks and shown on the Creator/AnimeNetwork with subtitles. It will be getting a bilingual rerelease in December 2013.

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!!This series provides examples of:

* AbuseIsOkayWhenItsFemaleOnMale: Poor Junpei, usually due to Kanako.
* AccidentalMisnaming: Kanako often calls Junpei "Koubaka" (a portmanteau of his last name "Kousaka" and {{Baka}}.
** Kanako calls Junpei "Nekouji" in the pool episode. It's a portmanteau of neko (cat) and ouji (prince) and translates as Prince Kitty.
** Nagi's nickname for Kanako is D-Cup.
** These are all Type D of this trope.
* AccidentalPervert: Junpei ends up like this a lot, especially with Kaede. Accidentally copping a feel during the BeachEpisode, for example.
* ACupAngst: After seeing the little "accident" Junpei had with Kaede, Kotone pats her chest.
** Nagi frets about her small chest size.
* AdaptationExpansion: To some extent. The manga is still quite young, and the anime is able to shoot through two chapters with one episode. Perhaps as a way to avoid [[OvertookTheManga Overtaking The Manga]], some new storyline material has surfaced as early as episode 7 that wasn't part of the manga.
* AmbiguouslyGay: Junpei's friend Haruhiko, at least in his mannerisms. He's been known to buy [[{{Hentai}} eroge manga]] and was the one to start peeping on the girls during the FuroScene mentioned below. However, he was all-too-willing to wear the maid outfit during the school festival...
* AndCallHimGeorge: Kaede with cats in the first episode. She doesn't actually ''kill'' them, but her habit of luring them with food to hug and cuddle them freaks out the local cats. The first favor Junpei has to do for cats is to get her to stop.
* AndNowYouMustMarryMe: Nagi often threatens Junpei with this if he keeps [[CannotSpitItOut holding back his feelings for Kaede]].
* AppliedPhlebotinum: At one point, Akari [[spoiler:casts powerful destructive and evil-sealing spells that ends up sending an evil cat spirit to another dimension]]. However, she can't do it without eating ''pocky''.
* ArmorPiercingSlap: Akari's preferred method of attack, in contrast to Kanako and Nagi's MegatonPunch.
** She did give him the MegatonPunch a couple of times though.
* ArtificialRiverbank: Where Kaede and Junpei meet a few times during Junpei's physical training.
* BalefulPolymorph: What will happen to Junpei if he doesn't perform 100 good deeds for cats.
** [[spoiler:He briefly turns into a cat in the final episode of the season, but turns back into a human eventually.]]
* BattleAura: Kanako and Nagi often have one, usually when they're jealous/mad at Junpei.
* BeachEpisode: More like Public Pool Episode, but still.
* BeautifulAllAlong: Kanako normally dresses in an overexaggerated ganguro style, but beneath it she's actually pretty nice looking. After the maid episode, she completely abandons manba fashion.
** Kanako's BeautyMark under her left eye is more noticeable without the makeup.
* {{Bifauxnen}}: Nagi looks boyish enough that even Junpei is mistaken at first.
** Her personality does revert to a more girlish side whenever she sees lightning. Even her ''voice'' is radically different.
* BigNo: At the end of episode 1 (in GratuitousEnglish, no less!)
* BishieSparkle: Happens to several characters, usually Junpei or Kaede.
* BlueWithShock: Happens to a few characters, usually Junpei.
* BrickJoke: When Ichinose Nagi first challenges Kousaka Junpei to a duel, she temporarily ducks and cowers when lightning, representing her [[HotBlooded passion]], flashes in her own ImagineSpot. This seems to be completely played for laughs until, later in the same episode, a plot point reveals - in the same overblown humor - that Nagi has a [[FearOfThunder crippling fear of lightning]].
** Also used for the note itself. When Kotone gives him her confession, he immediately thinks it's another challenge, and is surprised when it's actually a confession. When he shows up though, it's Akari who's waiting for him, and she ''does'' challenge him.
* ButtMonkey: Everything in the world hates Junpei.
** Nagi's grandfather is one to Nagi.
* CannotSpitItOut: Junpei has a really tough time telling his feelings for Kaede despite numerous opportunities. Both Kanako and Nagi are quite angry about it as well.
* CatGirl: Every female member of the cast (and some males) are represented as one in the OP.
* CatsAreMean: Oh yes, yes they are. Poor, poor Junpei.
** Subverted since the cats ''are'' grateful for the favors he does for them (not that he has a choice in the matter due to his curse). Only a subversion since the cats have no problems with demanding those favors.
* CatSmile: This is especially the default happy face of Junpei's sister.
* ClingyJealousGirl: Kotone is very clingy when it comes to Junpei and has to be constantly dragged off by Akari. She does show jealousy when she perceives Akari as getting too close to Junpei in episode 10, but she doesn't really act on that.
** Further proven when she gets upset when Nagi gets a little too touchy with Junpei in her drunken state, but again she does not act on that.
** However, somewhat subverted by the fact that in the manga, she willingly steps aside to allow Junpei and Kaede to have some time together, noting that it was Akari who forced Junpei to go on a date with her.
** While they tend to argue about it, Kanako doesn't like seeing Junpei with other girls.
* {{Cloudcuckoolander}}: Kaede. She is unable to read the atmosphere at times and appears to go into another world entirely especially when it concerns cats and anything that has to do with her vision of manliness (having a Yakuza-style house for example).
** [[spoiler:Not only that, but she has not realised that she's got a crush on Junpei either.]]
*** [[spoiler: It seems she might have a clue towards the end of the anime. Whether that'll hold into the next season..]]
*** It does seem supported from the manga though.
* ColorFailure: Happens to Junpei occasionally.
* ColourCodedCharacters: Kotone and Akari, who wear black and white hair ornaments, respectively.
** Furthermore, Kotone primarily wears clothes which are mainly black, as Akari wears clothes which are mainly white.
** To summarize: Akari is a {{Tsundere}}, Kotone is a {{Yandere}}. Kotone is more ''dere'', while Akari is more ''tsun''.
* ComicallyMissingThePoint: Kaede interprets Junpei and Kanako's arguments with each other as being close friends, even if they're screaming at each other.
* ConspicuousCG: The cat statue when its head first falls off.
* CrashIntoHello: Junpei meets Kaede this way, although she sort of lands on his chest feet first. She proceeds to apologize and slap him silly to try and wake him up.
* CrossPoppingVeins: Happens to a few characters.
* CursedWithAwesome: Being able to hear cat's thoughts wouldn't be so bad, if Junpei wasn't allergic to them. And that other thing about turning into a cat...
* CuteKitten or cats in this case. It helps that Junpei's lovely ladies also love cats.
* DebutQueue: The first several episodes of the anime add one or two girls to Junpei's UnwantedHarem each.
* DifferentAsNightAndDay: Kotone and Akari Kirishima. Kotone is in love with Junpei (though only because she can't resist someone with that much misfortune) and Akari is against her sister being with anybody.
* DirtyOldMan: Chizuru has been described as such by Junpei on a few occasions.
** The monk plays this straight, and often dresses up to pick up women.
* DoesThisRemindYouOfAnything: In episode 7, the tip of Junpei's [[spoiler:thumb]] poking out of the water from between his legs in the hot spring.
* [[DudeShesLikeInAComa Dude, He's Like In A Coma]]: When Junpei passes out from his fever, Kanako [[spoiler: starts to kiss him, but stops because she knows he really does like Kaede over [[UnluckyChildhoodFriend her]].]]
* DrunkOnMilk: [[spoiler: Nagi gets drunk on drinking [[AlcoholHic hic(!)]] juice]].
* EarlyBirdCameo: Chizuru is seen delivering mail in the first two episodes, then is introduced in the third one.
* {{Expy}}: Poked fun at in the EyeCatch for episode 11.
--> '''Junpei''': "I look like [[ToAruMajutsunoIndex someone else]]? That's an illusion! I will shatter that foolish illusion!"
* EyeCatch
* EyeTake: In one episode, the cats that usually hang around Junpei kept on lecturing him, while at the same time, Kaede was having a cute conversation where she was trying to [[CanNotSpitItOut convey her feelings towards him]] while she was walking her dogs. Junpei was trying to listen to her, but the cats were talking so loud that he eventually couldn't take it anymore and shouted out for them to shut up. ''Everyone'' was so shocked by this sudden outburst that even Kaede's dogs had a clear "O_O" look on all of their faces.
* FanArt: Most shows with special end cards have them designed by published artists, but ''Nyan Koi!'' is letting the fans be the ones to make the show's end cards, resulting in a ContestWinnerCameo for whoever is chosen.
* {{Fanservice}}: ''All over the place'', particularly in [[BeachEpisode episode 9]] and the preview for the next episodes. Junpei's got a [[ShirtlessScene pretty good body]] too, as it turns out.
* FearOfThunder: Nagi's fear is so great that she cowers when thunder, representing her passion, claps in her own ImagineSpot.
* FreudianSlip: Nagi: "I'm going to check out these breasts--No(in squeaky voice), I mean the other members.."
* FuroScene: In episode seven, although the fanservice is mostly [[ShirtlessScene female]]-[[EstrogenBrigadeBait oriented]].
* GenkiGirl: Kaede Mizuno. She's a member of the Track and Field Club, so all that energy is being put to good use.
** Chizuru falls into this trope from time to time, usually if Junpei is around her.
* GenreSavvy: Harukhiko constantly jokes about Junpei being in a VisualNovel, and talking about events and flags regarding the main girls.
* GratuitousEnglish: Played with at one point. Nagi calls Junpei and Kaede lovers, but she says it in English. Junpei stops and wonders why she said it in English rather than Japanese (meanwhile, the [[FunWithSubtitles subtitles]] have fun with it).
** Nagi's fond of GratuitousEnglish in general, actually.
*** Well, so is Junpei.
** "'''''JEEEEEEEEEEEEEEEE-SUS'''''"
*** "'''''THRILLEEEEEEEEEER!'''''"
** "Haruhiko, GOOD JOB!"
** The [[spoiler:evil cat spirit]] in episode 10 says "shit!" at one point.
** "Is this a so-called ROOOVUU RETAAHH!?"
** Episode 7 also includes bit of [[GratuitousRussian Russian]] - that owner and cat pair (the cat is actually a real Russian consultant/VA Jenya), and apparently a comment about Japanese meditation in a later scene.
** Junpei says "I'm okay" after getting slapped awake by Kaede in episode 3.
** At the very end of episode 6, while talking to the Kirishima twins, Nagi spouts some rather interesting words:
--> '''Nagi:''' "Oh my God! Pineapple!"
* HairAntennae: Kotone and Akari both have it. It is also one of the few ways to tell the twins apart; Kotone only has one, while Akari has two.
* HamToHamCombat: Usually Junpei and Kanako, but occasionally the cats will do this to each other as well.
* IdiotHair: Indicative of her naturally air-headed personality, Kaede has it.
* IfItsYouItsOkay: Being the pervert that she is, Kotone often quietly admits in front of Junpei that she would gladly welcome ''anything'' he'd do to her if he wanted. Junpei usually either doesn't hear what she said, is to focused on more important issues at hand, or just doesn't know how to respond to her statements.
* ImagineSpot: Several characters do this throughout the series.
* IWantMyBelovedToBeHappy: Played with. Nagi threatens Junpei with marriage in episode 5 if he won't give Kaede a LoveConfession before the end of their day at the fair.
** Kanako shifts back and forth between this and being the rival to Kaede in a LoveTriangle with Junpei. One instance she'll deny having any feelings for him, then in the next she goes into ClingyJealousGirl mode when she sees him hanging out with Kaede. Which only further serves to confuse Kaede if they're dating or not.
* KarmicTransformation: Junpei will turn into a cat if he doesn't help at least 100 cats within a certain period of time. And if anyone finds out about his curse, it'll speed up his transformation.
* LampshadeHanging: During the [[BeachEpisode Public Pool Episode]] both Junpei and Kaede thought they were going to the library to study, yet turn up in swimsuits in the next scene. Tama helpfully pops up and explains that they rented them.
* LargeHam: Several characters, but usually Junpei or Nagi.
* LimitedWardrobe: Nagi always wears the pants to her track suit. Even while wearing her school uniform's skirt.
* LoveHurts: Kaede develops a sad look on her face in one episode after seeing Kanako yank Junpei away for some cleaning duties. It doesn't get lost on Nagi, who gets extremely upset that he made her feel this way, and sends a letter of challenge to him.
* LoveLetterLunacy: What appears to be a love letter turns out to be a letter of challenge from Nagi. Which Junpei promptly ignores.
** Later, Junpei receives one from Kotone, which Akari promptly grabs from him.
* MeetCute: Junpei and Kaede's first meeting involves her trying to rescue a cat from a tree and using Junpei as a landing pad.
** And then she tries to slap him awake...
* LoveTriangle: Within the main three (Junpei, Kaede, and Kanako), it starts with a [[TriangRelations type 5]], grows into a [[spoiler:4 thanks to Nagi's influence quite early on]], and is now at a [[spoiler:7, due to the fantastic events that have begun to unfold in the manga beginning with chapter 25]]. Love is complicated.
* MagicalGirl: Akari and Kotone, apparently. Only Kotone gets the TransformationSequence, though.
* MagicPants: Averted when, [[spoiler: in the anime, Kousaka gets turned into a cat because Kaede is figuring out that he's cursed. Kotone and Akari pick up his clothes after the transformation. When he changes back into a human, he is buck naked.]]
* MagicSkirt: In the manga and broadcast, Kotone and Akari seem to have some kind of portable shadow generator in their outfits. This [[PantyShot goes away in the]] [[TooHotForTV DVD Version]].
* MarshmallowHell: Chizuru does this to Junpei in episode 3 to thank him for helping her deliver mail. Unfortunately for him, she does it just as Mizuno happens to be walking her dogs by.
* MegatonPunch: Kanako's favorite weapon. Nagi's got one too.
* MsFanService: Pretty much all of the girls could be considered one, but Chizuru fits it the most. In one episode her only appearance is in some naughty underwear while spouting some random mailing stuff that doesn't add anything to the plot.
* NiceJobBreakingItHero: The premise of the show. Junpei accidentally knocks the head off the cat statue, and gets cursed by having to help out cats and hearing their thoughts. And if he doesn't do it fast enough, or someone finds out about it, he turns into a cat himself.
* NoSenseOfDirection: Chizuru. Which wouldn't be such a bad thing if she wasn't working for the post office. Cranked UpToEleven [[RuleOfFunny for laughs]] for the [[{{Woolseyism}} MewView]] in episode 10: Chizuru somehow ends up in China, [[BigApplesauce New York]], and eventually, Antarctica.
* ObliviousToLove: Junpei, something that Kanako grows increasingly frustrated with over the course of the series.
* OrdinaryHighSchoolStudent: Junpei
* PantyShot: Junpei (though not the audience) gets one of these when he first ran into Kaede. "[[GratuitousEnglish WHITE!]]"
** Junpei once again gets it (twice, no less) during episode 6, once each with both the Kirishima twins. Moreover, the panty shots are shadowed out.
** As is becoming standard for many anime nowadays, the audience [[TooHotForTV gets a view of both these scenes on the DVD versions.]]
* PastimesProvePersonality: Kaede is seen renting a video...about mafia bosses fighting with each other. Not what Junpei was expecting.
** She's also extremely psyched to find out that Nagi is a mob boss heir.
* RunningGag: Nagi is afraid of thunder/lightning because her grandfather constantly got hit by it as she was growing up.
** Junpei will almost always be in a NotWhatItLooksLike situation whenever he runs into Kaede while with another girl. Or when he yells at the cats because they're pestering him while he's trying to talk to her.
* SchoolgirlLesbians: Episode 4 [[spoiler: Nagi Ichinose, president of the Track and Field Club, challenges Junpei to a duel over Kaede.]]
** Subverted later on, when Nagi challenges Junpei to win Kaede over by the end of the day, or he'll have to get engaged to her.
** Also subverted in that very episode when Nagi explains she's not actually gay, but an "appreciator of beauty." So...bi-curious?
* SchoolFestival: With MaidCafe.
** Both Kaede and Kanako were {{Meido}} for their class MaidCafe. Junpei was bowled over by Kaede's look, while the whole class was amazed with Kanako, especially since everyone was seeing her for the first time without Manba hair and makeup.
* SecretKeeper: Junpei promises not to tell anyone about Nagi's fear of lightning, and also says he'll be there if she needs him. Which causes Nagi to start developing a crush on him...
** Junpei is forced to do this with himself, as revealing the curse to anyone else not only speeds up his own curse, but also affects that person. The Kirishima twins are exempt since they have magical charms/amulets that protect against it. To everyone else, Junpei just looks weird spending a lot of time with cats, considering he's allergic to them. The twins sometimes utilize this aspect of it to get him to do things.
* SequelHook: The end of episode 12 plainly says that there will be a Season 2, but nothing seems to be forthcoming so far...
* SheIsNotMyGirlfriend: Junpei is constantly accused or teased about dating someone when he really isn't, particularly Kanako or the Kirishima twins. He'd like to avert it with Kaede, but for whatever reason [[CannotSpitItOut can't spit it out.]]
* ShoutOut: The [[Manga/{{Saki}} Kiyosumi High School girls and two Tsuruga Academy girls]] make an appearance at ep 4.
** In episode two, there's a cameo of the two heroines of {{Onegai Twins}}.
** Episode eight. The [[MonsterOfTheWeek Cat of the week]] has some [[Franchise/MetalGear interesting eyesight.]]
** [[ToAruMajutsuNoIndex Episode 11's]] EyeCatch.
** See WatanabeShinichi below.
* ShipperOnDeck: ''Nyamsus'' of all characters shows signs of being a Junpei/Kanako supporter. Junpei's family on the other hand seems to ship him with the Kirishima twins [[spoiler: while Nagi prefers Junpei/Mizuno.]]
* SpeaksFluentAnimal: Junpei, but only with cats and not by choice.
* SpitTake: A frequent sight in the series.
* SpoilerOpening: While it's definitely not hard to tell that Nagi is a woman, her appearance in the opening as a catgirl (along with the rest of Junpei's love interests) three episodes before she even appears in-series makes one wonder why it was treated as a surprise at all.
* StalkerWithACrush: Kotone, who stalks Junpei and keeping a fantasy diary which involves her and Junpei.
** In episode 8, she goes as far as bugging Junpei's house, and even contemplates installing a hidden camera in there just to spy on him. Stalking taken to new levels.
* StandardSnippet: The "here are our sponsors" jingle is "Flea Waltz". In Japan, the title is "I've stepped on a cat" (titles from some other countries also have something to do with cats).
** Funnily enough, in Russia it's knows as "''Doggy'' Waltz"
* SouvenirLand: Tokiwadai Land, complete with some sort of cat creature that looks to be the park's Mickey Mouse.
* StealthHiBye: Nagi instantly appears in episode 5 after her name is mentioned by Kanako while they're having lunch in the classroom.
** Nagi does it again in episode 8.
* SuspiciouslySpecificDenial: In episode 6, Kanako claims she's not interested in hearing Junpei's [[ThoseTwoGuys friends]] gossiping about him going after a twin-tailed girl, but she insists they tell her anyway. Nagi uses a similar threat.
* ThanksForTheMammary: Nagi does this to Kanako in episode 4. Hilariously, she squeezes it again after about a 2 second delay from the first one, before Kanako finally [[MegaTonPunch uppercuts]] her.
** Junpei finds out Nagi is a girl this way as well later in the same episode.
* ThemeTuneCameo: Junpei is shown hearing the OP song on his headphones as he's walking, early on in Episode 1.
* ThoseTwoGuys: Haruhiko and Kouta, Junpei's two guy friends who are seen occasionally in his class.
* {{Transsexual}}: [[spoiler:Chizuru's love interest, to her surprise, is now a woman.]]
* {{Tsundere}}: Akari's attitude towards Junpei fits, as does Kanako's. Both are Type A Tsunderes.
* TwelveEpisodeAnime
** At least until Season 2.
* TwiceShy: Both Junpei and Kaede like each other, but neither one seems willing to make the first move. Other girls expressing interest in him also serves to confuse Kaede as to whether he's dating them, or may not really be interested in her.
* UnluckyChildhoodFriend: Kanako, though her relationship with Junpei is a lot more turbulent than usual.
* UnsettlingGenderReveal: Inverted, [[spoiler: Nagi is actually a woman.]] She is not happy about Junpei applying this trope to her.
* UnwantedHarem: Junpei looks like he's developing this. Of course, taking care of the cats is more of a priority over this.
* WatanabeShinichi: Nabeshin shows up as a bus driver early in the seventh episode.
* YakuzaPrincess: Nagi.
* {{Yandere}}: Kotone. [[spoiler:She sends an e-mail warning Junpei not to go further than holding hands with Kaede, or something might happen to his body. Then again, she's nice enough to let him continue his date with Kaede after [[GenreSavvy understanding the "situation"]].]]
* ZettaiRyouiki: Both the Kirishima twins. Akari's a Grade S while Kotone's a Grade A.
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