Kurokami Medaka, a first year, is elected as Student Council President, and the first thing she does is establish a suggestion box, later dubbed by students the "Medaka Box." Medaka encourages students to submit any problem to the box without hesitation and promises to take on any issue from anyone.

Since Medaka won the Student Council elections with a staggering 98% of the vote, she ends up as the Council's only member. She asks her childhood friend, Hitoyoshi Zenkichi, for help and he grudgingly agrees, becoming the Student Council's lowest ranking member. Soon Medaka recruits two more people to the Student Council, the former judo club member Akune Kouki as secretary and the current swim club member Kikaijima Mogana, on loan for 300 yen a day, as treasurer.

Now the Student Council members spend their days solving the problems submitted through the Medaka Box, whether they be hooligans in clubs where they don't belong, girls who need help writing love letters or people who've lost their pets, gradually earning the respect and admiration of the entire school.

The Adresia empire on the Vogel continent. There is a battle over the throne of such an empire that possesses powerful military and vast territory.
With the successor undecided, the children of the emperor are vying to expand their power. However, there was one prince that everyone says will definitely not become the emperor.
The seventh prince, Arnold Lakes Adler. The young man who was inferior to his younger twin brother in every way, the dull prince.
Incompetent and lethargic, Arnold wastes everyday just playing around. However, behind the scenes, he is one of the only five SS-Class adventurers called ‘Silver’.
Seeing the intensifying battle for the throne he decided “I don’t want to die so let’s have my little brother become the emperor…”
This is the tale of absurd secret manoeuvres of the prince who is uninterested in the title of the emperor.

Isamu doesn't stand out, and everyone calls him a "side character" behind his back. Even his passion for running doesn't get him anywhere on the track team, so he spends his nights languishing at a low-paying part-time job. It feels like everything he's holding in is going to boil over, but when people start getting infected with a mysterious illness that turns them into monsters when sexually aroused, he will have to learn how to control the urges he has pent up inside in order to survive.

Things about girls that adolescent boys dream of with full delusion. While saying, “A man is really stupid!”, Yuime Nemuri likes him, so she can’t refuse him when such things take place! Instead, it all seems to be a mess…?!

Kodo Ikusei Senior High School, a leading prestigious school with state-of-the-art facilities where nearly 100% of students go on to university or find employment. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Kodo Ikusei is a paradise-like school, but the truth is that only the most superior of students receive favorable treatment.
The protagonist Kiyotaka Ayanokoji is a student of D-class, which is where the school dumps its "inferior" students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Suzune Horikita and Kikyo Kushida, two other students in his class, Kiyotaka's situation begins to change.

Three centuries ago, a vampire by the name of Migiri was running a reign of terror across Japan when a hero named Naonosuke Kobayashi cut off his head and sent him to eternal rest... until now.

Mochizuki General Hospital boasts some of the most well-trained (and well-endowed) nurses in town. But though these ladies spend much of their day battling disease, their after-hours are spent fighting a very different sort of disease…Under the leadership of the hospital chairman, a handful of staff members and local teenagers form a group of mercenary assassins, targeting the “cancers” of society and excising those individuals before their wickedness spreads.
(Source: Yen Press)

Summer of a high school third grader. 18-year-old boys high school student Takae Reika who struggles studying for university entrance examination accidentally meets 38-year-old super beautiful Misa. "A woman seems to have a really good smell" - Reika who fell in love with Misa who just had broken up with her boyfriend, will pretend to be his 25-year old brother to fill up the age difference between them. I do not know that Mr. Misa also has a secret ... .... A 20 year old difference love comedy "18 year old boy high school student x 38 years old unmarried woman" starting with a lie!

The Mangakas's imagination about yuri stories behind famous paintings.

Tazuru Kazami is a death row inmate who murdered 89 people in just a few years. With her murders gaining a reputation as beautiful "art," the number of copycat crimes has recently skyrocketed and become a social problem. In the midst of this, the imprisoned Kazami offers to hand over information about the copycats on the condition that she speak to a certain someone. The young man she chooses is a run-of-the-mill college student.

Hanakizawa Haruzawa, a very normal high school student, gets reincarnated into a new world because of an accident. A goddess tells him, "I want you to save the world that is dominate by magical beings". She then gives him a power called [The Double Sky Leader]. And this ability grants him the ability to manipulate boobs as much as he wants! How will the story of Haruzawa–who lives in a world with princesses, female knights, female executives, cat eared girls, and other mesmerizing women–unfold!?

Shindo Manabu is a student at a very prestigious high school whose goal is to get into Tokyo University. He studies constantly and tries to never lose sight of that goal. That is until his childhood friend, Amano Megumi, who goes to the same school starts to distract him. He originally only remembered her as the tomboy she was as a kid, until they meet up again and he notices how "developed" she has become. As these two get closer to each other, hilarity often ensues and subsequently, Manabu becomes more and more distracted from his goal of getting into Tokyo U.

Nagumi Koushi is a 12-year-old boy who was abandoned by his broke father after their house caught on fire, leaving him to roam the streets penniless. Then one day, a girl named Minerva who finds him lying on the sidewalk takes him to a women’s college dormitory, one known for housing troublesome residents, and asks him to be their "Dormitory Mother." Surrounded by older women and forced to deal with their idiosyncrasies, Koushi starts his new (somewhat ecchi) life!

Nishimura Hideki is a young man who once confessed to a person he thought was a girl online, only to find out that this person was actually a boy. He keeps this story secret and swears he'll never trust a girl online again. However, one day a girl online confesses to him, and it turns out she is actually a beautiful girl named Tamaki Ako. But Ako unfortunately cannot tell the difference between the online world and reality, and she is also a loner who has trouble communicating with others. Hideki and his friends from the guild then decide to work together in order to help her understand the difference between real life and online gaming.

Thirteen years ago, an unidentified wall of light suddenly appeared around Sumihama. In order to return to his hometown, which had been cut off from the outside world since that day, Gataka Oro (24 years old) crossed the wall. At that moment, he was engulfed by a blinding light, and when he woke up, he found himself in the body of a child. Furthermore, his estranged childhood friend, Hime, appears before him just as she was back then. His body and her appearance, a nostalgic scenery, familiar places... Is this the world thirteen years ago?

Bar, an ordinary middle-aged mister* and a veteran adventurer, lived an easy, comforting life in the Imperial Capital. He would carry items for adventuring parties or help the guild’s staff from time to time.
“Mr. Bar, glad to have you today!”
“Thank you for your words.”
That uncle who was liked by everyone in the capital, was actually the strongest arsenal of the Empire–One of the “Laevateinn”–Bartolomeus.
“Please step forward, Lord Bar.”
With a delicate and beautiful elven girl, Welhe Mina, to back him up, his gallant figure racing across the battlefield or the political battleground was simply godly—like a War God.
The heroic tales of the dowdy adventurer AND the mightiest arsenal starts here!

When you call for domestic help, it's your classmate who comes...?! A daily short series of romantic comedy with a maid classmate!

This is the story of a delinquent who “gives birth” to a formless creature that uses a sex doll as her body.

A college student buys a new apartment dirt cheap and the reason was that once the front door is opened from the inside it connect to a dungeon in another world instead so he goes to an adventure in the dungeon and meet new companions which treat him as a the Great Sage

From MangaHelpers:
This is the story of a pair of step-siblings who are now living alone together. The high-school-age older sister, Kyoko, is pretty wild (and is even into pro-wrestling), while the elementary-school-age little brother is a fairly serious kid. He is often embarrassed by her teasing. The two of them pass their daily life together, every day cooking for one another.