Shimoneta (shorter version or ShimoSeka) is a manga adaptation of the light novel with the same name written by Akagi Hirotaka, in English it's translated as "A Boring World Where the Concept of Dirty Jokes Does Not Exist", published between 2014-2016. It has 23 chapters collected in 4 volumes, Yuzuki N' being the artist.

It's about a revolution, Japan has become the purest society ever on Earth, no one is talking about sex, no one masturbates, no one is comparing boobs, boys don't flip girls' skirts and girls don't try to impress the boys with skimpy outfits and no one is telling dirty jokes. Can you imagine such a world? Could you survive in that world? On top of that, all children have some SF chokers that control their actions, any perverted thing is prohibited and strictly controlled. Enter these high school boys and girls (an organisation named SOX) who fight against the system in the name of perversions and dirty jokes, will they save Japan?
Fortunately, this manga is a comedy, take the synopsis literally and have fun with our main characters committing obscene acts of terrorism in order to defeat the system and liberate Japan from this oppression of thought. It's one of those ideas that sounds stupid on paper but when executed, it becomes a fun read and really entertaining.

To be fair, this manga was like your usual ad for the light novel, the first two volumes are very fast paced, even compared with the anime (which came a year later), the first 12 chapters correspond with the anime's first 11 episodes and the remaining two volumes contain a new story arc, also filled with perversions and craziness. The only disappointment I have with this manga is that it doesn't have a clear and concise ending, which is normal, there was no interest in adapting the whole LN material, this was just a segment from the overall story and we should be thankful for that, even without an ending, this is truly entertaining to read for fans of ecchi & comedy. My other complain is that it's not ecchi enough.

It's a manga that doesn't take itself seriously, it's supposed to make you laugh in this weird SF scenario and also arouse you a bit with some sexy scenes. The setting is a high school, all the characters are teens with some exceptions.

The main attraction is clearly the main girl Kajou Ayame, she is the biggest pervert you could think of, talks dirty, thinks about sex all the time, has photos of naked chicks in her pockets, she is a true "woman of culture" and a revolutionary, what's her motivations? because it's fun, dirty jokes are fun, insert some fake tragic past about her father who was also a pervert terrorist to make it cheesier and we're good. She wears a pair of panties on her face occasionally.
The more cliches here the better, we also have a normal high school boy who doesn't wanna be a pervert but becomes a member of SOX, a crazy yandere who's a pervert but doesn't have a clue about sex, a cute annoying loli girl and another perverted loli, a childhood friend who likes the main dude, also an ugly guy who wears a women's bra.

The characters really make the story here, I liked all of them, they are weird and crazy and anything can happen when they are around. And because we can't be focused on plots to destroy the government all the time, we get sexy situations. Girls falling on top of the main character, accidental kisses (and I am not talking about the girl's upper lips), anyways, let your imagination flow. Unfortunately, it's not To Love Ru or Sora no Otoshimono level of ecchi but something is there and it's a feast for the eyes. Overall it's wacky and disgusting in some parts (love nectar cookies are the best cookies a girl could bake, read it to find out about this wonderful recipe), but that's the appeal, it's for people who like this kind of comedy, want a good laugh and look at girl's bodies.

The art style is good, the girls are beautiful, nice backgrounds (but not detailed enough, I say it's like your mediocre high school manga-like) and the sexy scenes look appealing and delicious but don't expect nipples, it's a hidden detail, the anime is more ecchi than the manga, I feel it works anyway, it's ok I guess, like I said above, it doesn't compare with well established ecchi manga, it's more comedy and the ecchi is the cherry on the top, and of course it's small compared to the cake, we also get many bath scenes. The characters look 95% the same as in the anime, so no major differences here.

I liked it because it's my kind of comedy, it's rough and dirty and doesn't care about "feelings", if a girl has a big rack, Ayame will say how hot she looks and that her rack would be good for paizuri. The main guy is kinda boring, he doesn't like dirty jokes as much as others but he begins to change throughout the manga.
If you like dirty jokes and obscene characters, give this manga a try. I recommend it to Shimoneta anime viewers too, the last two volumes are comprised of LN material which wasn't adapted in the anime and the chapters are fun, we meet some new characters and we get lots of obscene stuff typical for this series.