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Literally ''Perverted Mask'', ''Ultimate!! Hentai Kamen'' is a 6 volume {{manga}} by Keishuu Ando. Mild-mannered Kenpo specialist Kyosuke accidentally puts a pair of panties rather than a robbers mask on when he tries to sneak in and spoil a robbery. His mother's 'perverted blood' awakes within him, he strips, and the baddies are toast. [[HilarityEnsues Hijinks ensue]].

It got adapted into a live-action movie in 2013.

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!!Contains examples of:

* AccidentalPervert: Often. It doesn't help that IJustWantToBeNormal Kyosuke has inherited his mom's S&M-lovin' genes...Come to think of it, it was an AccidentalPervert incident that created Hentai Kamen to begin with.
* AdaptationalWimp: In the movie, Kyosuke initially pretty much sucks at martial arts, where in the manga he was one of the club's strongest members even as a rookie first-year.
** AdaptationalBadass: Hentai Kamen, however, gets to benefit from ''this'' trope as he's shown dodging and even ''catching'' bullets at close-range.
* AffectionateParody: The movie seems to take some pages out of Film/{{Spider-Man}}'s playbook, what with HK's whips being used in a similar manner to Spidey's webbing. There's also a montage of HK manga images at the start of the movie, similar to the opening MARVEL logo in Franchise/MarvelCinematicUniverse films. For that matter, HK in the manga is something of a parody of classic tokusatsu heroes, frequently breaking out in a SuperSentaiStance or similar AsskickingPose.
* AllJustADream: [[spoiler:The ending of the live-action movie.]]
* AllMenArePerverts: Sometimes. Especially when [[HelloNurse Shunka]] is involved.
* AnAsskickingChristmas: the Christmas chapter in volume 2, of course.
** CrucifiedHeroShot: Parodied during the Christmas episode, when Hentai Kamen swaps himself with the crucified Christ figure in a church, before laying his trademark perverted smackdown on a loan shark and his goons. While incidentally wearing a [[NiceHat Santa hat.]]
* BadassNormal: Kyosuke becomes increasingly the most normal person (as his normal persona) with strength, although this starts to drain near the end.
* CallingYourAttacks: Subverted, averted, inverted, lampshaded, and turned upside down. "Inferno Bullet Train", anyone?
* CoolMask: Subverted.
* CovertPervert / ChivalrousPervert: Kyousuke, Tengu Maru. Kamen is definitely the latter, using less gross techniques on women - although he's rarely in a position to fight them to begin with. He also can't figure out why people pass out when he walks so close...
* DistractedByTheSexy: Shunka has a fighting style that intentionally invokes this in her enemies, and she uses it against Kyousuke in her first appearance: "Mysterious Shiki Style: [[IronicName Honorable Lusting Fists]]". Besides also being an ActionGirl, it probably goes without saying that she's MsFanservice.
** HoistByHisOwnPetard: Of course, upon transforming into Hentai Kamen, he promptly turns the style right back at her.
-->'''Hentai Kamen''': "[[IronicEcho Please feel anywhere you'd like!]]"
* EverythingIsBetterWithSpinning: One of HK's finishing moves is him literally spinning with his groin on his opponent's face [[IncindiaryExponent while on fire]]. It goes to its logical extreme during the fight against the Fake Hentai Kamen, where they end up spinning groin-to-groin against each other in mid-air.
* EvilCounterpart: The Fake Hentai Kamen shares most of HK's abilities, but actually relies on the frustration of not being able to fulfill his perversion, unlike HK who just lets his pervert side go wild.
** To clarify, Fake/Bizarro Hentai Kamen is an even bigger pervert than HK, who gets off on being humiliated by those around him. [[EverybodyHasStandards Even HK finds this to be utterly disgusting]].
* FinishingMove: see CallingYourAttacks. Unlike most examples, though, HK doesn't normally seem to repeat his Finishers, instead using a different technique for each battle.
* GroinAttack: Goes both ways. Characters get hit in the groin, and Hentai Kamen himself tends to attack ''with'' his groin.
* HeroicResolve: In the movie. "There's no law that says you're only as strong as you are perverted!"
* HumongousMecha: [[spoiler: The villain busts one out at the end of the live-action movie]].
** ShoutOut: [[spoiler: It looks like [[Anime/NeonGenesisEvangelion Evangelion Unit-01]] dressed up as a piece of heavy construction equipment.]]
** [[spoiler: AntiClimaxBoss: HK lands a OneHitKill on it after [[EleventhHourSuperpower putting Aiko's panties on his face]].]]
* InTheNameOfTheMoon: occasionally, like during the Christmas episode:
-->'''Hentai Kamen:''' "The one who breaks the dreams of innocent children, Akutoku Fudosan! Hentai Kamen has descended from heaven to deal with [[GivingSomeoneThePointerFinger the likes of you!]]"
* JawDrop: Many, many, many people, usually as their reaction to Hentai Kamen appearing before them.
* ManInABikini: The titular mankini wearing/wielding hero of justice.
* MaskPower: What else would you call it when a guy gets superpowers from wearing panties like a Lucha mask?
* MySignificanceSenseIsTingling: Whenever Kyosuke's detective instinct flares up (inherited from his father), it usually comes to him in the form of something "not smelling right". It comes to him in sound form during the second biker gang incident, though.
* OhCrap: The usual expression of people who're about to go in to Kamen's underwear, face-first.
* OnlySaneMan: Kyosuke and Aiko; mostly the former.
* PaperThinDisguise: The Fake Hentai Kamen is obviously a middle-aged, scrawny man with a red/pink mankini, while HK is incredibly buff with a white mankini. People still get fooled.
* PunchPunchPunchUhOh: The tournament, with the 100 Erupting Horsefly fists...getting tangled in Hentai Kamen's underwear straps.
* RunningGag: Several; people's heads caught in Kamen's underwear (leading to facefaults/fainting from spectators); Shunka trying to pass off something good of Shuto's for something bad of hers, and then wrapping her brother's head in a large version of whatever it is when he corrects her; Aiko's crazy strength when it comes to Kyousuke; the Captain attacking, getting Ishida to root for him - only to realized that he's [[CampGay hitting on the opponent]].
* ShipTease: Kyosuke/Aiko, Kyosuke/Shunka. He marries the [[spoiler: latter]] in the end.
** Shunka doesn't appear in the film, but there are elements of Kyosuke/Aiko and Aiko/[[LovesMyAlterEgo Kyosuke]].
* SpellMyNameWithAnS: Kyosuke's name has a drawn-out 'o' sound, so it's just as good to spell it Kyousuke, Kyohsuke, Kyoosuke, etc.
* SplitPersonality: At one point in the film, Kyosuke has an argument with his HK persona inside his own mind.
* SpoofAesop: In the live-action movie: "You don't need to be a pervert to be strong!".
* TooKinkyToTorture: Just when a villain thinks HK is done for while his minions pummel him to the ground, he gets up and reveals being beat up arouses him, and as such gives him more power.
* WidgetSeries: If the plot didn't tip you off that this series is a widget, then ''nothing'' will.
* WrestlerInAllOfUs: Some of HK's moves have a vibe of this. Only they include more dick than usual.
* XMeetsY: CaptainUnderpants, but with panties.

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