History Manga / WorldsEndHarem

* HotScientist: Maria Kuroda is a NerdsAreSexy example.

* BreedingSlave: Reito and the other surviving men doesn't seem to have a choice but to father as many children as possible. While Reito is given one month to find the woman he loves, it's also because he chose her for having children. However, he is pushed to give up on that and choose from the present women very often.

Compare to ''ComicBook/YTheLastMan'', which shares the premise of women having to rebuild society after the near extinction of men, and the surviving male being in high demand. Compare also to ''Manga/{{Ooku}}'', which uses a smaller-scale variation on the premise in Edo Japan. ''Film/SexMission'' too has a similar plot, where two men wake up after hibernation, having overslept the man-killing M bomb, rise of a totalitarian female regime and being thrust into life or death situation the moment they're out of cryo-sleep.

Mira tells Reito that he is one of only five males who were somehow made [[TheImmune immune to the virus]] by the experimental Cellular Sclerosis cure they recieved during cryostasis: Reito is the second so far to be woken up. Meanwhile, the first subject they revived proved capable of fathering male children immune to the virus, but not through artificial insemination; only those conceived through sexual intercourse acquired the father's immunity. Given these circumstances, the government intends to use Reito and the others as breeding stallions to have sex with and impregnate as many women as possible so that their children can replenish the world's population.

** [[SchoolIdol Shion Hoshino]] was one of the most beautiful and most popular girls at school and one of the few people who didn't bully Shota Doi; however, she also had no sympathy for him either and would often ignore him when he was bullied. She's unable to pursue her dreams of celebrity due to the collapse of society, so she came to Shota to beg for his help. He subjects her to a ShamefulStrip and and orders her to have sex on the school rooftop, remembering how she chose to eat lunch there while ignoring him being bullied in front of her. In tears, she has sex with Shota.

** On the women's side, the assistants of the surviving males like to emphasize that every women presented to them is there under her own will. Technically true, but as they also explain, the UW provides the women in the harems with the best treatment possible to ensure their babies will be born healthy. Taking into account the [[CrapsackWorld crapsack state of the world]], it's effectively a LeonineContract because mating with the remaining men is the only hope most of them have to escape a terrible life outside.

[[TwentyMinutesIntoTheFuture The year is 2040]]. Pharmaceutics students Reito Mizuhara and Erisa Tachibana have been in school together for more than a decade, from elementary school all the way up to university at the Japan Advanced Medical Institute. One day, Reito confesses to Erisa he has always been in love with her, and his confession is reciprocated. However, Reito has been diagnosed with Multiple Sclerosis, a life-threatening degenerative disease that currently doesn't have a cure. Therefore, he will be kept suspended in [[HumanPopsicle cryo sleep]] until the cure is found. Before he goes to sleep, Reito just wanted to tell Erisa his feelings and [[IWantMyBelovedToBeHappy push her to find someone else]], since he doesn't feel it's right to make her wait for him. To his surprise, Erisa declares [[IWillWaitForYou she will wait for him]] as long as it takes.

When Reito awakens five years later, he opens his eyes to a world that has turned completely upside down. A stoic, beautiful woman named Mira Suou introduces herself as his exclusive agent, and explains that although they found a cure for his Multiple Sclerosis, humankind was struck by a catastrophe [[SleptThroughTheApocalypse while he was asleep]]: Four years before, [[ThePlague an extremely lethal and contagious new virus]] surfaced on the planet, one that mysteriously [[{{Gendercide}} only targets men]]. Over 99.9% of the world's male population was killed by what they dub the MK or Man-Killer virus; A small number of men escaped into cryostasis to wait for the cure, but they will still eventually die from the virus if the cure is not found. Now the survival of humanity is in peril since there are no males around to father children, and even male babies conceived through artificial insemination die as soon as they're born.

Mira tells Reito that he is one of only five males who were somehow made [[TheImmune immune to the virus]] by the experimental Multiple Sclerosis cure they recieved during cryostasis: Reito is the second so far to be woken up. Meanwhile, the first subject they revived proved capable of fathering male children immune to the virus, but not through artificial insemination; only those conceived through sexual intercourse acquired the father's immunity. Given these circumstances, the government intends to use Reito and the others as breeding stallions to have sex with and impregnate as many women as possible so that their children can replenish the world's population.

* AnguishedDeclarationOfLove: Reito only gathers the courage to confess to Erisa when he thinks he has only some time left among the living, since he's been diagnosed with multiple sclerosis.

* TheImmune: The women theorize that a combination of contracting multiple sclerosis, going into cryostasis in hopes they would find a cure during his cold sleep, and consequent treatment during said sleep made the five men immune to the virus, now possessing valuable genes that the women compete over to birth a new human race.

* IWantMyBelovedToBeHappy: What Reito originally intended for Erisa, he only confessed his feelings to get it out of his heart before his imminent death by succumbing to multiple sclerosis, urging her to find someone else, reminding her that she is very popular and has been confessed to by a popular senpai not long ago. Erisa doesn't comply to Reito's wish and says she will wait for him to be cured during cryostasis, in hopes that their advanced society will find a cure during his cold sleep.
* IWillWaitForYou: Erisa ignores Reito's plea for her to find someone else, for he being cured of multiple sclerosis is only supported by the possibility of the super AI's of their time finding a cure during the period he is preserved in cryostasis, Erisa says she will wait for him and that a cure will be found for sure.

** The fourth man, Zen, is pretty much everything Reito would have been if the women were less impatient; he also had a sweetheart and a decent life before the incident, but he's thrust into a civilization that won't take "no" for an answer and use him as an out and out BreedingSlave for a whole group. Unlike Reito though, he actually was separated from his developing family, given he impregnated his fiancee.

* HotSpringsEpisode: The girls and Reito go to one in one chapter, and attempted to try and seduce him there.

* KarmaHoudiniWarranty:
** Shion Hoshino and Erica, two popular girls that mistreated their nerdy classmate Shota Doi and refused to show him compassion when he got a deadly disease. It appears that they got away with their mistreatment of him when he was put into cryostasis for five years. But when Shota awakens, things change:
*** Shion Hoshino was one of the most beautiful and most popular girls at school and one of the few people who don,t bullies Shota Doi; however, she also had no sympathy for him either and would often ignore him when he was bullied. Two moments show how uncaring Shion truly is to Shota. First, when Shion and two of her friends saw Shota being stripped of his clothes and bullied on the school rooftop, her friends wanted to leave, but to her friend's shock, Shion said she wanted to eat here and sit down and eat her lunch while ignoring what happening to Shota. Second, when Shion explains to his class why he will be absent because of his disease, she gets a phone call from her boss and just leaves, not offering him a single word of condolence. Shion Hoshino could not become a celebrity due to the collapse of society, so she came to Shota to beg for his help. Shota told her to strip; shocked, Shion asks if he's joking, he admits that he is; in the anime; as he leaves, Shota tells Shiona she can't expects him to help her after all she did. But Shiona does strip to her underwear when she could not get help from the other girls because of her age. Later Shota tells Shion that he will help her if she sleeps with him. Shion agrees, assuming they have sex in the dorms, but to her shock, she is forced to do it on the rooftop in front of three girls. Shion asks if they can find a room; Shota tells her he wants to do it here, remembering how she chose to eat lunch there while being bullied; in tears, Shota has sex with Shota.
*** Erica was a beautiful popular girl and the girlfriend of Shota Doi's main bully Takamatsu and would take part in the beating and humiliating of Shota, but her life fell apart during the five-year gap. When Shota's handler Karen Kamiya brings Erica to him, she reveals that Erica has become a drug addict living in the slums, and she is then forced to become the school janitor and Shota's pet. Shota would take his revenge on her by beating and humiliating her like Erica used to do to him. First, he poured a bucket of water on her and made it clear that he would not tolerate her attitude or her calling him his old embarrassing nickname. Then Shota makes it clear that he's not going to have sex with Erica; instead, he makes her kiss one of the scars left by the cigarettes burns her boyfriend's left of his leg; next, he chains her up in his room and forces her to watch as he has sex with girls. Finally suffering from both drug withdrawal and being chained up in Shota's room, Erica woke up and begged for medicine at night, Shota put the pill in his mouth, and when she was forced to use her mouth to get the pill, Shota used the opportunity to kiss her.

%%* AsYouKnow: Literally. Class reviewing the MK Virus.

*** Shion Hoshino could not become a celebrity due ot the collapse of society, so she came to Shota to beg for his help. He only accepts if she agrees to sleep with him. She does, assuming they have sex in the dorms, but to her shock, she is forced to do it in the rooftop, remembering how she chose to eat lunch there while he was being bullied.
*** Erica was a beautiful popular girl and the girlfriend of Shota Doi's main bully Takamatsu and would take part in the beating and humiliating of Shota, but her life fell apart during the five-year gap. When Shota handler Karen Kamiya brings Erica to him, she reveals that Erica has become a drug addict living in the slums, and she is then forced to become the school janitor and Shota's pet.

** Shion Hoshino and Erica, two popular girls, that mistreated their nerdy classmate Shota Doi and refused to show him compassion when he got a deadly disease. It appears that they got away with their mistreatment of him when he was put into cryostasis for five years. But when Shion awakens in the new world, they find themselves at the bottom of the food chain and at Shota's mercy.
*** Shion Hoshino was one of the most beautiful and most popular girls at school and one of the few people who don,t bullies Shota Doi; it was implied that Shota had a little crush on her. However, Shion shows that just because she is not one of Shota's bullies does not mean she sympathizes with him. When Shion and two of her friends wanted to eat lunch on their school rooftop and saw Shota being stripped of his clothes and bullied, her friends became uncomfortable and wanted to leave, but Shion, to her friends' shock, said she wanted to eat here and sit down and eat her lunch while ignoring what happening to Shota. Later, when Shion explains to his class why he will be absent because of his disease, she gets a phone call from her boss and just left, not offering him a single word of condolence towards him. So when Shion Hoshino revealed to Shota Doi that she could not become a celebrity in this new society, she begged for his help in becoming a celebrity. Shota just tells her to strip; shocked, Shion asks if he's joking, he admits that he is; in the anime; as he leaves; Shota tells Shiona she can't expects him to help her after all she did. Shion also finds that she can't get any help from her new classmates because of her age. So Shion strips and goes to class in nothing but her underwear. Later, when Shion meets Shota on the school rooftop, he agrees to help her if she sleeps with him; Shion agrees, assuming they have sex in the dorms, but to her shock, she sees three girls coming to the rooftop. Shota tells her so let's get started, Shion ask if they can find a room, Shota tells her he wants to it here, remembering how she chose to eat lunch while he was being bullied, Shion with tears in her eyes, agrees and his sex with Shota in front of those three girls.
*** Erica was a beautiful popular girl and the girlfriend of Shota Doi's main bully Takamatsu and would take part in the beating and humiliating of Shota. When Shota got the disease that forced him to be in cryostasis for five years, her life fell apart during the five-year gap. When Shota handler Karen Kamiya brings Erica to him, she reveals that Erica has become a drug addict living in the slums. Erica was forced to become the school janitor and Shota's pet. Shota gets his revenge on Erica by humiliating her by first pouring a bucket of water on her and making it clear that he will not tolerate her attitude or her calling him his old embarrassing nickname. Then Shota makes it clear that he's not going to have sex with Erica; instead, he makes her kiss one of the scars left by the cigarettes burns her boyfriend's left of his leg; next, he chains her up in his room and forces her to watch as he has sex with girls. When Shota asks Erica what happened to her boyfriend Takamatsu, and she admits that she doesn't know what happened to him, Shota admits that he does not care if he is alive or dead. Erica angrily protests, him holding a grudge from five years ago; Shota angrily reminds her that while it was five years for her, it was just a day for him. Finally suffering from both drug withdrawal and being chained up in Shota's room, Erica woke up and begged for medicine at night, Shota put the pill in his mouth, and when she was forced to use her mouth to get the pill, Shota used the opportunity to kiss her.

* GoneHorriblyRight: [[spoiler:Three years following the development of the vaccine, men have been protected of the MK-virus. However, thanks to the vaccine being somewhat sabotaged, all of the vaccinated men have lost their libido and sexual drive, triggering the new plot.]]

A second spinoff, ''World's End Harem: Brittania Lumiere'', was announced in 2020. This one surprisingly is a more female focused reverse harem premise, with the heroine an ordinary school girl who gets summoned to a fantasy world of magic where females were wiped out. She is made the subject of a goddess project and her harem her protectors.

* OhCrap: Reito get this feeling when he sees the woman who entered the bathroom while he was taking a shower easily break the door handle to keep him from leaving so they can get "comfortable". Of course her idea of getting "comfortable" is forcing herself on him.

* DoubleStandardRapeFemaleOnMale: Downplayed. Reito doesn't seem to have much issues with receiving unwanted sexual advances from his female friends, but an actual rape attempt by women is portrayed as an utterly vile act.

* ConflictBall: Reito held himself pure for Erisa, but [[spoiler: when he reaches a point where saving the world literally depends on him mating with someone, it's better if it's "heartfelt sex," and she's an option, he suddenly starts considering her [[JustFriends a childhood friend]] instead of immediately picking her as his chosen sex partner. This is completely at odds with his previous attitude toward their relationship, solely happens to cause cheap drama, and lasts for about two seconds before he picks her. Then she suddenly refuses with no explanation.]]

* TheBeautifulElite: You could make a joke that the virus didn't wipe out only the men on earth, but any woman that didn't fit within a strict standard of beauty as well. Actually its downplayed and justified, in that there are unattractive women present, they just don't interact with protagonist, since they are less likely to arouse him, and thus are useless for world government which tries to make him breed. All the women in the series who do interact with protagonist have the looks of super top models (and even the younger ones are adorable), wearing fetishistic clothing as casual wear to boot.

* AllWomenAreLustful: The absence of a male populace in the five years the MK Virus had spread out, apparently made women very willing, extremely so, to engage in mating sessions with the five remaining men on earth. Many women blush uncontrollably in Reito's presence, and those are the allegedly civilized ones; the women dropped on the fallen cities completely lost themselves in despair, so that the very sight of Reito prompted one of them to pursue him like an animal in heat.

* AbsenceMakesTheHeartGoYonder: Suou Mira bears a striking resemblance to Erisa, but with a different personality and bigger breasts. The visible differences aren't much in the face of the absurd situation before Reito's eyes though, with Suou throwing herself at him, Reito sometimes sees Erisa on her and is a step away from letting go of his original love. Still Reito finds the resolve to preserve himself till he finds out what happened to Erisa in the new world.

* AbsenceMakesTheHeartGoYonder: Suou Mira bears a strikingly resemblance to Erisa, but with a different personality and bigger breasts. The visible differences aren't much in the face of the absurd situation before Reito's eyes though, with Suou throwing herself at him, Reito sometimes sees Erisa on her and is a step away from letting go of his original love. Still Reito finds the resolve to preserve himself till he finds out what happened to Erisa in the new world.

Compare to ''ComicBook/YTheLastMan'', which shares the premise of women having to rebuild society after the near extinction of men, and the surviving male being in high demand. Compare also to ''Manga/{{Ooku}}'', which uses a smaller-scale variation on the premise in Edo Japan. ''Film/SexMission'' too has a similar plot, where two men wake up after hibernation, having overslept the man-killing M bomb, rise of totalitarian female regime and being thrust into life or death situation the moment they're out of cryo-sleep.

Compare to ''ComicBook/YTheLastMan'', which shares the premise of women having to rebuild society after the near extinction of men, and the surviving male being in high demand. Compare also to ''Manga/{{Ooku}}'', which uses a smaller-scale variation on the premise in Edo Japan. ''Film/SexMission'' too has similar plot, where two men wake up after hibernation, having overslept the man-killing M bomb, rise of totalitarian female regime and being thrust into life or death situation the moment they're out of cryo-sleep.

* GratuitousRape: The lesbian AttemptedRape scene that opens up chapter 32. To wit, neither the perpetrator nor the victim are people the reader has seen before, and only the victim is seen again after the scene is over (and even then, she is a very minor character). And the identity of the rapist isn't the only thing that goes unexplained, the work never tells the reader ''why'' this near-rape scene happened. It ends up being just a very weird introduction to a minor character.

In April 2018 a little spin-off started serialization, this time in ''Ultra Jump'' thus going into {{Seinen}} territory. ''World's End Harem: Fantasia'' is set in a completely different setting, in a fantasy world of warriors and magic on the verge on human extinction due constant attacks from other species. A king receives a prophecy that humanity's crisis can be averted by sacrificing a specific maiden, a solution that seems to be connected to a young adventuring hero and his merry band of female companions. And so, their tale (and trouble) begins. In May 2020, it received a HighSchoolAU called ''World's End Harem: Fantasia Academy''.