Komugi: She's with her male friends right now.
Nanako: Don't you mind that?
Komugi (blushing slightly): Not at all.
—An idle discussion among members of the Hen Zemi club
Tropes included in the work:
- All Men Are Perverts: Subverted because everyone is a pervert, though some more than others.
- Artstyle Dissonance: The art style is absolutely adorable Puni Plush which would fit right in alongside any children's anime. The content is some of the most frank examinations of the most vile of fetishes found in any medium.
- Delinquent: Anna seems to be one on the outside, but subverts various aspects of the role.
- Does This Remind You of Anything?: The fruitflies in Miwako's ears. Think about it a bit.
- Emotionless Girl: Makiko
- Fetish: One of Komugi's various fetishes is Netorare.
- Guilty Pleasures: Nanako seems quite non-perverted when compared to the rest of the cast, but as the series progresses she begins to like and admit some of her odder preferences. Such as enjoying the smell of her flatulence in the bathtub, or beginning to strip at a party when the lights went out.
- Gross Out Show: Interestingly, most of the gross-out is purely verbal, in the Manga no so much.
- I Drank What?: In Episode 10. It turns out that the content of the bottles used in various indirect kisses were... enriched... with various bodily fluids.
- Indirect Kiss: Central topic of episode 10.
- Lighter and Softer: Some consider the Anime already too much for their tastes, yet it is actually tamer than the Manga, where even more unusual fetishes are discussed and shown, the source material actually has sex happening on-panel, unlike the Anime.
- Lovable Sex Maniac: Miyako. It is seen by the way she acts, but don't you just love that puni plush ahegao face.
- Moment Killer: Komugi purposely cranks Nanako up to peak anticipation, then casually switches tracks. Also Hishiyashu's mother, who frequently bursts into his room while Anna is visiting.
- Only Sane Man: Nanako all the way.
- No Periods, Period: notable exception
- Not So Above It All: Nanako. She may seem all pure and innocent, but the constant exposure to various fetishes begins to take its toll.
- Panty Thief: Nanako finds Komugi stealing panties in the first manga chapter, he explains that it's for an assignment for the Hen Zemi class, and he's not really stealing them for fun, but rather as Schmuck Bait so he can study thieves that come to steal them from him. He then asks if he can have her's. (She obliges, which ends up saving her bacon.) The Stinger at the end of the chapter reveals that not only was that a complete lie, he has a self-imposed quota of 20 pairs a month.
- Phenotype Stereotype: Makiko is from England and, of course, blond and blue-eyed.
- Puni Plush: Makes the extremely squicky things discussed even worse.
- Really Gets Around: Myako, she likes being humiliated, extremely so by any man, coupled with Komugiís cuckold fetish, she has had sex with many different men, often on Komugiís request.
- Refuge in Audacity / Refuge in Vulgarity: The series in general, but Komugi in particular does this with a casual shamelessness, earning him the title of 'Perverted Knight' from the professor.
- Sesquipedalian Loquaciousness: Used in combination with Idiosyncratic Episode Naming; episode titles are worded as if they were thesis pages.
- Sick Episode: Episode 6