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''Eiken'' (rhymes with "[[strike:[[PunnyName achin']]]] taken") is an 18-volume manga series and two-episode {{OVA}} by Seiji Matsuyama, where a [[UnluckyEverydude dorky kid]] named Densuke gets dropped into a school full of large-breasted girls vying for his attention...but he just wants the eyes of the "cutest girl in school", Chiharu. Hilarity and [[{{Ecchi}} extremely suggestive]] hijinks ensue as Kirika Misono, a HotAmazon / {{Jerkass}} / ParkerLewisFerrisBueller, shanghais both of them into her private fiefdom, the Eiken club, to serve as her [[ButtMonkey Butt Monkeys]]. At least this means Densuke has an excuse to talk to Chiharu now...

''Eiken'' is most well known in the West for its OVA, although [[AdaptationDecay it's a loose adaptation that hardly covers the original manga at all]].

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!!The Eiken manga and OVA contain examples of:

* AccidentalPervert: Densuke.
* AbsurdlyPowerfulStudentCouncil: They attempt to disband the Eiken club in a manga StoryArc.
* AuthorAppeal: If you read the other mangas written by Seiji Matsuyama, you learn that they almost ''all'' feature school girls with breasts that are so big, they enter into circus freak territory. In fact, Eiken is probably an example of Seiji Matsuyama actually showing some restraint and really is one of his tamest mangas to date.
* CharlesAtlasSuperpower: Lin Grace, Rai and Den.
** BoobsOfSteel: Averted in that Lin Grace has one of the normal cup sizes in the series. Rai and Den undeniably fulfill this trope, though.
* ChineseGirl: Lin Grace.
* ClingyJealousGirl: Yuriko, Chiharu's sister who decides to try seducing Densuke away from her sister.
* CovertPervert: The Teacher.
* CuteShotaroBoy: Densuke; Kirika makes him fulfill the [[{{Crossdresser}} crossdressing]] aspect of the trope.
* {{Determinator}}: Densuke [[YouSuck is a failure in many ways]] -- but he'll go to amazing lengths for those he cares about.
* {{Dojikko}}: The Teacher, Komoe, and Densuke.
* ElevatorSchool: Zashono Academy -- [[ElaborateUniversityHigh it fills an entire island]].
* EnsembleDarkhorse: The Teacher -- she was created just to lampshade some FridgeLogic about the club having no adult supervision, and rapidly became one of the most popular characters.
* EveryoneCallsHimBarkeep: The nameless Teacher/Professor.
* FanservicePack: Chiharu's breasts gradually [[BreastExpansion grow]] over the course of the manga, starting with an impressive "88 cm" bust to a whopping "100 cm" - and it's implied that they'll keep growing further, like her mother did. The anime OAV takes this to a more ridiculous level, compressing all that growth within the span of what may amount in-universe to a single '''week'''!
* FetishFuel: Super Unleaded... Ultra High Octane... you name it, and it will still be not enough.
* GagBoobs (UpToEleven): To the point of RefugeInAudacity.
** Chiharu's mother Keiko holds the series' record at '''123.4 cm''' - and she admits to have been of a similar size to her daughter's at the latter's age; goodness, she's implying that her daughter is going to get even '''bigger''' than she is now.
* GadgeteerGenius: Kyoko.
* GayOption: Mikito, Chiharu's crossdressing brother (who tried to seduce Densuke [[LatexPerfection disguised as Chiharu]], [[BecomingTheMask and actually became interested]].)
* GuiltyPleasures
* HotForStudent: It rapidly becomes clear that the Teacher has it ''bad'' for Densuke, especially in the arc where Densuke has to meet her parents while being TheBeard for her.
* HotterAndSexier: The OVA takes the fanservice way over the top -- [[BeyondTheImpossible which is something, considering the manga]].
* HumongousMecha: Kyoko builds these; Densuke gets to be a guinea pig.
* IAmSpartacus: The climax of the student council arc, when it appears Chiharu will be forced to leave the school.
* ImagineSpot: Densuke.
* JekyllAndHyde: Inverted -- In the manga, HotAmazon {{Jerkass}} Kirika spontaneously changes into a YamatoNadeshiko around Densuke on occasion. He never figures out whether it's a SplitPersonality, if Kirika's tormenting him in a creative way, or if she's [[JerkWithAHeartOfGold letting the mask slip]].
* JerkWithAHeartOfGold: Kirika
* MomentKiller: Brought to you by ThePowerOfFriendship.
* MostCommonSuperPower: ''And HOW'' -- See GagBoobs above
* {{Nakama}}: The Eiken club.
* OfficialCouple: Densuke and Chiharu.
* TheOjou: Lin Grace
* ThePaolo
* {{Pettanko}}: Yuriko.
** In the anime she's C-cup (of course, this is compared to Chiharu's [[GagBoobs whatever-the-hell-cup]], so it's a moot point).
** Kyoko is a straight example.
* PrettyFreeloaders: The Eiken club, who essentially evolve into Densuke's [[TheUnwantedHarem Unwanted Harem]] as the manga progresses.
* PrincessCurls: Chou Ginten.
* TheRealRemingtonSteele: After several chapters where Densuke's forced to crossdress, his little sister makes a surprise visit to Zashono Academy...
** Ironically, Densuke was designed to look good as a girl...
* StormingTheCastle
* StudentCouncilPresident: Chou Ginten, a KnightTemplar BigBad for an arc from the manga. (She's technically the treasurer, but she's bullied the actual president into submission.)
* ThoseTwoGuys: Densuke's friends Shimada and Todoroki.
* TricksterMentor: Kirika, in her own way, acts as Densuke's guardian angel in his pursuit of Chiharu.
* {{Tsundere}}: Kyoko, Kirika.
* TwoTimerDate
* WholesomeCrossdresser: Mikito.
* YamatoNadeshiko: Chiharu.
* YumYum: There's a school competition that requires girls to eat chocolate-covered bananas! The anime also makes Kirika do this in almost all of her scenes.

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