The story sets one month Eita and Masuzu start dating, and sets itself on a "what if" where the Harem element is stronger than in the original.

Kaguya is a boy in an all-girls' school for demons [fox spirits, succubi, werewolves, etc]. Being the only human is bad enough, but the added risk of his manhood being discovered makes for silly and unbelievable (deliciously enviable) situations.

From Wikipedia: Yui Kusanagi, is the daughter of a Shinto shrine. She discovers a mysterious sword, which transports her to a different world where she meets the Greek god Zeus. He invites her to attend a school in a separate world that he created. Zeus intends to teach the meaning of love to the various young divine beings who also attend the school, in an attempt to reverse the weakening bond between humans and the gods.

From Imangascans: Mahiro has two goals in life: first, to finally confess to his childhood friend who he loved for so long and second, to become a famous model. But there are various obstacles in Mahiro's path! For one thing, he dresses as a girl, named Hanabusu Arisu, when modeling. As if that wasn't enough, every woman in his vicinity gets the urge to spread her legs because of the special pheromone he emits! Will Mahiro ever come to confess his love to Miwa, or will he simply widen his harem and get engulfed in endless orgy? Find out for yourself!

Without doing much research on the school or surrounding areas, Hibino Ryouichiro picks an art school in Hokkaido. Tricked by the school advertisements, he goes to the campus only to find out it is a desolate and cold campus. The only glimmer of happiness for Ryouichiro are the girls on campus. Just hours after meeting Kisaragi Riho, the cute girl on campus, she seduces him only to find himself outside naked after she is done with him. Feeling heartbroken and used, he finds comfort in Aso Tomoe, who lives on the floor below at the dorms. Although it is freezing outside, it is hot underneath the sheets for Ryouichiro.

Promo comic by Artlim Media for the second season of the Freezing anime. Recap of Freezing season 1. Original webtoon

In the near future, the National Police Agency establishes an elite covert paramilitary division called Minkei or Private Police in English to tackle violent criminals and gangs. Among its operatives include average school student Kou Shirashi and school idol Mikuru Nazume.

Kominato Riku is a high school student who aims to be a game designer. The girl next door is his childhood friend Haju, is in love with him, but he has fallen head over heels for the school idol Riko. And lastly, there is the transfer student, Nodoka. With that all said you’d think this is the start of some love-comedy harem, but a rumor spreads that Nodoka receives a message that says, “you will die soon”. Riku and the gang’s fate will change in a major way. Who will live, and who will love? Original Webcomic: http://comic-meteor.jp/shinuhito/

From Shoujo Manga Maniac: Lin is an average high school girl who has a huge crush on Daiwen, a popular TV host. Super Pop singer Gonjieh, who is Daiwen's enemy, transferred 6 months ago to Mushroom College. Phoebe and Jia are Lin's best friends and luckily end up in the same class. Unfortunely for them, Lienze, the no.1 delinquent in her school and who scares the living daylights out of Lin, also happens to be in her class. To make things worse, Lin's uncle appears, who she says is the root of all trouble. How will Lin survive?

From Intercross: Ooji Subaru transfers from an all-girls school to a co-ed school so that she won't be away from her father. She has had recurring dreams of a beautiful and gentle princess, but she believes that this is because of her admiration of princesses. Upon entering her new school, she encounters three guys -plus her childhood friend- who claim to be...?!

Eita enters high school aiming for the National University School of Medicine. Because of his parents' divorce--and his goal--he shuns anything to do with romance or love. One day Masuzu, the school beauty with the silver hair, who's just returned to the country, enters his life in a most unexpected way. Chiwa, his childhood friend since elementary school, will not let this go without a fight.

Aikawa Ayumu is a normal high-school boy, until one day he is killed by a serial killer. The necromancer Eucliwood Hellscythe revives him--but as a zombie. As he begins serving Eu as her guard, he happens to deprive a mahou shoujo (magical girl) named Haruna of her magic power. Haruna orders Ayumu to take her place and fight against anti-mahou shoujo system, "Megalo." From Yen Press: Life—or undeath?—isn’t easy for Ayumu Aikawa. A seemingly normal high schooler, he is in fact a zombie who serves as a bodyguard to an introverted necromancer. But his already complicated existence becomes even more outlandish when he accidentally steals the powers of a magical girl, transforming into one himself—complete with frilly dress and pink chainsaw!! How’s a reanimated corpse supposed to keep his head on his shoulders with roommates like these girls around the house?

The man with the hand of God. The scrub battle to become the best bath coordinator is about to start. Original webcomic

From Day of the River: “The person who killed my father...is among these people.” 15-year-old Kotobuki Ringo reunites with childhood friends she hasn’t seen in eight years since her father passed away: the calm and soft-spoken Shiran, the strong Kujyaku, the kind Masaki, and the energetic Gogyo. They were all students of Ringo’s father and all have amazing abilities of their own. Ringo comes to live with them at Shiran’s villa, but she’s not staying with them just to rekindle their friendship... She believes that one of them may be her father’s murderer, and she will stop at nothing to find out who was behind her father’s death.

Nemu is back home. What's gonna happen with Junichi's life after this reunion with his sister? "Da Capo" in Italian means "From the beginning"... then will we see the end to this romance?

A boy with female features is chosen by his drama club member to act as a fake girlfriend for their club, so they can practice on him before they actually get themselves girlfriends. This is series that started as a one shot and after a 1 1/2 year hiatus was given its very own series.

From Manga-Heaven: The Soul Score... that is something not unlike the threads of fate which tell the story of a person's life from the minute they are born to the finale of death. Few people can see this score, even fewer can manipulate it. After being hit by a car and nearly killed, Kyosuke Hibiki can see and hear this mysterious soul score. Soon after, he meets a girl named Tena, a "tuner" who is able to manipulate the score and remove discordant notes to bring it back into tune. Tena is determined to make Kyosuke her pet, but Kyosuke is none too fond of it. Yet, the two begin their dissonant duet...

It's the year 2269, and April Enus is working as a spy for the Alliance. She's known as "Venus" because of her special power: fatalities don't seem to happen when she's around. But is this power a blessing or a curse?

A young man finds and returns a lost wallet and cell phone to a beautiful young lady, thus begins the destined relationship between two strangers. Sound typical? Well then, how about making the young lady the young man’s future homeroom teacher, and give them both a twisted sense of right and wrong. And just for kicks, let’s have the young man help himself to a self proclaimed reward from the lost wallet before returning it… but of course, this scenario wouldn’t be complete unless the young lady was very unforgiving when it came to teaching one of her students a lesson on morals. (Source: Infinity Studios)

From Turtle Paradise: It's not that she tries to keep to herself, exactly: It's just that everyone seems to look right through her! Naturally, Sakuya Tohno has a complex about it. She says she's just like air: ever present, but never seen. All she wants is a friend, but building relationships isn't exactly easy for someone who is, for all intents and purposes, invisible. But then she hears a legend about the "Thousand-Year Sakura" and how, if one makes a wish beneath its perpetually-blossoming boughs, it's sure to come true. So in a moment of desperation, she races to the tree, only to find four very attractive boys waiting for her... And at that moment, beneath the cherry blossoms of the ever-blooming Thousand-Year Sakura, something incredible happens!

A highschool otaku named Aki Tomoya runs into his dream girl one day...only to find that she has the faintest presence to his chagrin! Now with his otaku passions, Tomoya wants to turn the girl into a heroine in the only realm he is familiar with: 2D dating simulation game. To accomplish this objective, he scouts Eriri Spencer Sawamura, his half-foreigner childhood friend equipped with artistic talent, as the illustrator, and Kasumigaoka Utaha, a famous prodigy writer, as the script writer.

Abiding by his father's will, Shougo was transferred into an academy where many young girls attend. It appears as though his younger sister (separated from him at birth) also attends this academy, and that she is trying to get closer to him without letting know him who she actually is. Problem is, Shougo seems to be popular with the other girls as well! Can Shougo "properly" reunite with his little sister and while making a girlfriend at the same time?!

In the Beast Harem series: Volume 1: Rakuen Danshi - Youko is a normal high school girl attending a not so normal high school. You see, Youko's school used to be an all boys school, so after transferring to this school she is the only female in her class, and that surely can cause a few problems! She is being constantly teased by her classmates, especially by Mastsushima Soushi, whom she hates the most!But not everything is bad, Youko is in love with Narumiya Kouei, the only one who helped her since she entered the school. But if the one Youko loves is Narumiya, why does she finds it so hard to stay away from Mastsushima, who she 'hates the most'? - From Aka Roze Tenshi Volume 2: Gokujou Rakuen Danshi - Youko and Soushi start dating. However, summer break is approaching, and Youko has to be separated from Soushi. Not if Soushi can help it. He is working with Narumiya to save up for their summer vacation hot spring trip. Yet, shadows are coming to destroy the couple's love. Will this love rival succeed? Or will Youko and Soushi' relationship survive and have their first time? Volume 3: Jun'ai Rakuen Danshi - Youko and Soushi are on their lovey-dovey vacation. There, they meet Narumiya and his famous girlfriend. Youko prepares to give her first time to Soushi but finds it extremely hard due to sharing a bedroom with friends and the pain. Upon seeing Narumiya and his girlfriend together, Youko grows worried. Will Soushi and Youko have their first time at the hot spring? Or will Soushi get tired of Youko's immatureness and end their relationship?

A new teacher finds himself a newly appointed position as a teacher at an all girls school... on an island... in the sky! How will he make do in his new surroundings? Or the residents of this island who seem like they came from another world? And what's more, how will he fare at being a teacher?