In the medieval fantasy world of Alfheimr, succubus princess Astarotte Ygvar--the first princess of the kingdom of Ygvar--has just reached the age of 10. In the coming years, it is necessary for succubi to obtain a male harem. To maintain their appearance, they must consume a substance only found on males called "Sauzfryma", better known as semen.
The princess, however, detests males and will only agree to create a harem if a human male joins.

From Paperdolls Project:

Hotaru Kunoichi of the Iga Village has accepted a request to infiltrate Oda Nobunaga’s castle, Aduchi Castle. Under the guise that she is the younger sister of Mitsuhide, Nobunaga's confidante, she investigates the Oda army for dissenters. Hotaru deepens her relations with great military commanders, from Nobunaga to Hashiba Hideyoshi and Tokugawa Ieyasu. However, it will all be over if they find out who she truly is . . .

Gakuen Heaven is the story of Oshino Makoto in his attempt to become a teacher, in order to fulfill a promise made to his childhood friend and first love Koiwai Ayano, who also promised that when they see each other again they will get married. Unfortunately, he fails miserably and ends up as a substitute teacher in an all-girls private school governed by his grandmother. He meets a lot of female students there, especially Narusawa Tsugum; as well as a teacher who resembles his long lost first love, Asagiri Ayano. He even becomes the love interest of the substitute principal, his cousin Kyoko.

Yamada Tarou is living a regular life, until the death of the father he never sees catapults him into the role of the 13th King of the holy Phantasma kingdom. Now that he's king, Tarou has become the target of assassins, and all he has on his side is a mistress, Princess Kaguya, whose goal is to make Tarou a worthy king.

The Japanese government developed a military project where they created "Iron Princesses", schoolgirls who were altered to strengthen their body by replacing their bones with steel and artificial muscles. The Iron Princess are experts with the katana and are allowed to fight in the streets to determine the cream of the crop. Those who repair the Iron Princess are medical experts called Toui and they work to maintain and improve the girls. Sakuradamon is an academy built to train girls like Asami Honoka, an Iron Princess and Nagamitsu Yomogi, a Toui. Asami is a mysterious and powerful fighter while Yomogi is a medical child prodigy and they have to work together if they value their lives on campus.

Eun-soo Cha is the main character of the story. Eun-soo has hated her Mother ever since she was abandoned by her. Raised by her Grandma, she became a wild child that likes to fight. She has even disguised herself so well as a guy that people won't believe her even if she says she's a girl. She can fight well, and is even referred to as hot by girls. One day, however, her Grandma's already bad health worsens, and she promises not to fight anymore. When Eun-soo's grandma dies soon after, she decides to leave Dae-Jeon (where she lives) and goes to Seoul to live with her Mother, despite still hating her, because she has nowhere else to go. There, she runs into one of the best fighters, at her new school, and immediately gets on his bad side. What will happen? Will she break her promise to her grandma? Will love bloom?

Based on the Korean Internet Novel, "암컷늑대의 BOY" by i쿠키i조아 (iCookieiLike)

Shinta likes to play with cats even though he cannot have one for a pet because of his father's allergies. Cats also like to play with Shinta... in more ways than one... including becoming Shinta's girlfriend and generally trying to get him to reciprocate their catcalls, literally.

One day Shinobu wakes up just to find a naked blonde girl sleeping besides him. He has no memory whatsoever of her. Who is she? Why is she in his bed? Why is she naked? To make matters worse, his sister comes in and sees them. What will happen now?

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.

Note: The 3rd volume is an ebook only.

Mizutani Souta is confessed to by the school's famous frail beauty Aizawa Shino. Then came another one of her! And another! And another! Each with different attitudes, but all of them are Aizawa Shino herself. What will this sort-of harem love story come to!? Another tsukkomi-all-you-can offering from the creator of Fujimura-kun Mates!

From MangaHelpers:
Kusumi Chiharu gets a message one day that he has been selected as a Monster Tamer, and he is prompted to select his first partner. He thinks little of the message until he receives a giant package the following day. He assumes it's the porn books he ordered, but the huge box ends up containing the unconscious body of a mostly naked girl! She's a ghoul named Zonmi, who intends to fight with him as his partner. However, it turns out that other hot girls at his mostly-male high school are also magical creatures, and Zonmi may not be the only one who wants to fight by his side.

Brothers Conflict manga focused on Tsubaki and Azusa.

In the year 20XX, the decline in birth rates is a serious problem. To counter this, the government has established an outrageous academy. The academy's goal: "To teach boys and girls how to properly date, and in the near-future create good families through marriage." In a school where the doctrine of "love" has gotten out of hand unfolds the ultimate love battle of two virgins!

An almost road accident victim loses his memory after being pushed to a street power line pole to save his life. Not knowing his identity he is compelled to stay at his savior's residence a gym and boarding house for female wrestlers until he remembers. During his stay he becomes his savior's manservant and the gym's referee trainee.

After an incident that left Kou Fujimara grievously injured; losing sight from both eyes, the college student undergoes surgery and miraculously survives. However, this event significantly changes Kou's life, as he gains extrasensory perception abilities. Soon, a woman appears, and the boy's life changes overnight.

From Chibi Manga:
A love-comedy story of a shikigami finally start!

From MangaHelpers:
Second Lieutenant Mononobe Yuu has been sent to Midgard, to attend the all-girl's school where his sister Mitsuki is the student council president. The school is specifically for people who have "D" powers, who are needed to fight dragons, and both Mitsuki and Yuu fit the criteria. On his arrival, he meets and befriends another classmate named Iris Freya, who is having difficulties with her "D"-related schoolwork. They will do their best to succeed in this dangerous world.

For her brother Subaru's sake, Hitomi decides to take his place at an all male prestigious high school for a year until he recovers and is discharged from the hospital. She gets to the school and runs into a few strange guys on her first day, but as soon as she tells them her name - they are surprised and make her go to the Lion Club. Hiding the fact that she's a girl will be difficult enough and now she has to deal with this strange group who are forcing her to join their club because they all believe that in their past lives they were members of the Shinsengumi!

Description by LuffyNoTomo

From Dan of Population GO:
Based on the light novel of the same name, Kishimine Kengo has avoided playing video games his whole life in a society filled with it. Instead, he prefers the comforts of books of which he has a tendency to get drawn into the story, perhaps a little too much. Every time he reads a story he unintentionally imagines reliving the story as the protagonist. When Kengo learns of the Modern Game club fate may let him use his imagination for another medium, video games.

From Senpai Scans:

Himesato Ui has just enrolled in her late mother's old high school, Shinomiya Academy, as a first year! Hatsu's mother was known as "Prima", the most beautiful girl, in the Academy. Ui was full of hope and expectations in enrolling in the Academy, but she was puzzled by the Academy's system of evaluation for students was by a point system. Furthermore, in the school, she met an unknown pretty boy?!