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The series takes place in an alternate version of Japan called Great Japan, in an alternate timeline where the Tokugawa shogunate remained active and has remained isolated from the rest of the world. The story takes place at Buou Academic School, an academy located at the base of Mount Fuji where children of military families train to become samurai warriors. The academy is in the middle of a power struggle between Yukimura Sanada and Matabei Goto of the Toyotomi faction and the powerful student council that rules the school, and Muneakira Yagyu, the owner of the Yagyu Dojo, and the mysterious Jubei Yagyu are dragged in the middle of the conflict. The series features famous historical figures from Japan's Sengoku period and early Edo period. The character Charles d'Artagnan also comes from the same age in Europe. (Source: Wikipedia)

An anthology comic of Infinite Stratos by various mangaka.

Shuu, an underperforming student at the Hero Academy whose swordsmanship and magic skills have not developed, is finally advised by the headmaster to leave the academy! Two beautiful witches suddenly appear before him and reveal he is the chosen one who has inherited the soul of the Demon King, whose mighty power he needs the cooperation of six witches to manifest. Shuu quickly masters the basics of magic, and for the first time in his life, he is able to use magic and successfully clears the final examination on which his expulsion hangs!! Shuu then decides to first become a hero with the power of the Demon King as a prerequisite to becoming the Demon King that the witches desire... The peerless boy Demon King's academy fantasy begins! (Source: Takeshobo, translated)

Ichinose Kouta is transferring to the academy his grandfather runs. He knows little about it, except for the fact that the students are mostly female, so he imagines that his life will soon become a delightful harem-type story. When he gets lost on the way to the isolated school, he finds out there's a lot his grandfather didn't tell him. The school is actually an all-girls school for ninja! At first, the girls think he's an intruder, and he barely escapes with his life! Luckily, the misunderstanding is cleared up, and he finds himself under the protection of the beautiful and deadly student council president, Fuyunagi Rindou. But even now, his life will be anything but uneventful, as he finds himself in the middle of an ongoing conflict between Fuyunagi's student council and another student group, headed by a girl known as Momochi Yayoi. (Source: MangaHelpers)

At one time, a hero has been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended, the commendable hero slayed the demon king, and he was forcibly deported back to earth after being dismissed. "Give me a break! Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all." Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world. (Source: Shousetsuka ni Narou)

From before the dawn of time people ("Crimsons") have been controlled by a deadly foe ("Clients") who think themselves gods. Now, at the turn of the twentieth century, the Crimsons still live in fear of the Clients. Powerful individuals protect themselves by making sacrificial offerings of live human beings. Dark Hunter, Shion, is half-Crimson, half-Client - in other words a vampire. With his loyal sidekick, Rain, he wages an endless war against the Clients. When Shion meets Helen--a young girl whose family were butchered by the Clients--he makes a blood oath and takes Helen as one of his followers.

The story follows Erina's route in the Dracu-Riot game. Erina is a foreign vampire from Russia and she is very ecchi, her conversations often involve ecchi stuff which makes Azusa really edgy and Yuuto nervous.

Kure-nai is about the adventures and misadventures of 16-year-old Kurenai Shinkurou. Shinkurou is an authority in settling disputes between people, and finds his life turned upside down one day when he is assigned as a bodyguard for Kuhouin Murasaki, the daughter of a powerful plutocratic family. (Source: ANN)

Based off the popular Japanese PSP game, Photo Kano is about a boy, his interest in photography, and the harem that grows out of it. (Source: MU)

Getting stressed out by school? Don’t worry, the hall monitor on S.L.U.T. duty is here for you!

Our protagonist is a 40 year old male virgin. Normally, he masturbates up to 10 times while looking at photos from the idol meet and greet events he goes to but upon the 12th time he dies of a technobreak and finds himself reincarnated in another world. In this new world, the gender ratio skews heavily towards females to the point that they make up most of the workforce. Not to mention everyone has animal ears! Another interesting fact is that males only go into heat once a year but Norun, as our protagonist is known as, carries a gift that allows him to go into heat at will. With this discovery, what adventures (and pleasures) will Norun experience in this new world? (Source: Denpasoft)

Kousuke suddenly wakes up alone in a vast forest that clearly isn’t anywhere on Earth. Now he has to find some way to eat, drink, and survive! Luckily, Kousuke also has the power to craft using a special video game menu that allows him to harvest resources and build whatever he can imagine. However, every time he goes to sleep, he’s attacked by one of the many non-human races of this world, all of whom despise humankind. Enter Sylphy, the beautiful dark elf who lays claim to Kousuke and vows to protect him–after all, she’s taken him as her property! (Source: Seven Seas Entertainment)

A high school senior named Yotaro thought he was an only child — until he met his real mother and discovered that she has 19 daughters, from 0 to 18 years old. He ends up living with his "true family."

It all begins with Tomoki and Tsugumi Kirihara, two siblings who have a really "close" relationship, as the history develops more girls will want to have a piece of what these two have to give.

After partaking in a challenge between the Deviluke sisters to see who can withstand cold temperatures the longest, Lala Satalin Deviluke falls sick due to her unwillingness to give up. Worried about her wellbeing, Rito Yuuki decides to go to her room to check up on her. However, when he accidentally steps on one of her peculiar inventions, he inadvertently transforms into a thermometer, causing the situation to turn quite steamy... [Written by MAL Rewrite]

Rintarou is deeply judgmental of women, and hates that his dad has been cheating on his mom with a female neighbor. He does not want to be like his dad, and his thoughts are full of gendered sexual slurs towards his female classmates. The only exception is the most modest girl in his class, Yatsugi Azusa. A mosquito-borne disease seems to be spreading around among the women in his city, whose symptoms are fever and extreme sexual aggressiveness. Will he and Azusa make it through the epidemic? (Source: MangaHelpers)

Year 202X. Japan adopts the polygamy policy.

Tomo-kun, an office worker, is neighbors with Aki-san. Aki often comes over to Tomo's house to drink alcohol with him, but when she gets drunk her secret is revealed, she's actually... part cat! As Tomo-kun continues his life, other part-animal Oneesans will come to drink with him. (Source: Takeshobo, translated)

Mark Stuart had realized something terrifying: he had been reincarnated as the mid-boss in a game! In the original game, he was fated to be condemned by his daughter, Forsina, who was known as the “Ice Maiden.”　Reflecting on his past coldness toward her, he resolves to change his fate by earning her affection. Through his thoughtfulness and his actions as a duke, his daughter begins to regain her love and trust in her father, but he ends up going too far, and her love becomes overwhelmingly heavy, putting him again in danger of getting condemned...!? (Source: Kadokawa, translated)

Severely allergic to felines, Yuuto Amakawa spends his mornings nursing a drippy nose courtesy of his friend Rinko's cat. But on his sixteenth birthday, it's not just Rinko's pet that's riling up his allergies (to say nothing of his hormones)! Appearing before him is Himari, a buxom, sword-wielding cat spirit in human guise, who has sworn to protect Yuuto, now the target of vengeful spirits! It's clear that Yuuto's allergies are the least of his problems — he's gonna need Himari's help if he wants to live to see his seventeenth birthday! (Source: Yen Press)