The Japanese title is too long for the associated names so it is included here:
ボウソウガールズテキモウソウレンアイテキステキプロジェクト(B・G・M・R・S・P)

The story of a combined rivalry and friendship dating back to childhood between Beniko and Aoi. They only have one thing is common, and that is that they both love girls. Now they both attend an all-girls academy, and Aoi is more popular with the girls! Even worse, every girls Beniko has a crush on is interested in Aoi. The time for revenge in here!

Private tutor Sawa has unrequited feelings for his student Nitou Nanao. Sawa has decided to love Nanao until he leaves to study abroad, but one day Nanao tells him he’s interested in having sex with him. Not being able to refuse him, they delve into an unsual relationship.

Housemaid Hee-yeon fullfills the master's orders perfectly. Neat posture, perfectly done household chores, special spirit of service. An unfortunate and beautiful housemaid comes in a complicated family. Hayangji + Youngmo comes back with a new elegant work. Twisted scandal in a mansion started by dangerous woman Hee-yeon.

As a six year old, Rintaro is diagnosed with Henisei Tashu Ijou Syndrome (also known as Hentai Syndrome), a disease that could kill him if he gets sexually aroused. To save him and provide a way for him to live as normal a life as possible, his father teaches him the ways to control his body and mind for ten years in the mountains, with the martial art of the Koei Sougetsu. When he's 16 he chooses to enroll Nangokuren High School, which he assumed to be the biggest all-boys school in the country but is actually the biggest all-girls school that has just gone coed.

On his first day he stumbles upon a large scale battle and learns that the first rule of the school is that it "Abides the Law of Nature" which has turned the campus into a war zone-like environment. Rintaro now sees transferring out as his mission, but will it be that easy now that he's caught the eye of the 3 "Dragons", the bodacious female leaders of the three biggest factions around?

Five romantic, passionate, sexy stories about modern women and the men they love.

Voices of Love
The title story follows a relationship between young teacher Mika Tsukahara and Naokazu Kuga, an 18-year old student at her school. They're neighbors too, and can't control their attraction to each other!

One Summer's Day
At a high school reunion, a girl sees a close guy friend that she hasn't seen for a long time. He tells her about his girlfriend who hasn't done it with him yet and asks the girl if she will instead. She agrees. This reminds her of their high school days, when she comforted the guy and became sex friends from that day on. Is high school going to repeat itself all over again?

Rainbow Smile
A girl has a boyfriend who lives with her in her apartment. However, he hits her and mistreats her. And she just takes it. She also know he cheats on her, but she fools herself into thinking he isn't. Will she just take it forever?

Pictures of Us
A business office man hasn't had a relationship in a long time, and he's lonely. He joins an online dating service and meets with a girl one night. She looks really young, but she says that she's in her 20s. A few days later, she somehow ends up staying with him. Can he open his heart to her? And what is her real age?

Teach Me Love
A young guy is university art student. He lends his guy friend a CD, and his friend breaks it. In repayment, his friend brings him a girl, and he tells the art student guy he can do whatever he wants with her for a night. The art student notices she does whatever his friend tells her to. And he also notices his friend also let's other guys 'borrow' her. Why does she let him do this to her?

A collection of Rei Mikamoto's one-shots.

Three of the one-shots were originally published in "Bijo Amanda".

Meet Handa Sei, a second-year in high school. Occupation: calligrapher. Admired by the whole school for his cool charisma, Handa is, in fact, naturally negative and sincerely believes that the whole school hates him!

A comedy about the misunderstandings of adolescence and mistaken impressions.

From JanimeS:

The world of Siesta is set in fantasy Europe where there are people called bullet users who were discriminated against badly for reasons unknown to readers as of volume 1.
The discrimination has gotten much weaker due to Grande Corp's efforts to wipe out the decades-old pirate faction with the help of Bulletron, a battle suit designed exclusively for bullet users.

The story begins as the protagonist Dia Canto tells you a little bit about herself: how she became an orphan, how she met her foster family, and how she is very much in love with her step brother, Loe. However, her affection toward Loe is brutally crushed before it would even bear fruit and she goes out to vent her sadness. This is when she encounters Cid Leon, who she would ultimately be paid to "protect".

The emotions between these two are fresh like a strawberry and sweet like a cup of milk tea. Love is blossoming all over this campus!

Yuzuru ran away from Daisuke after high school but bumped into him again years later at his company. Was it fate or is everything going according to Daisuke's plan. Can Yuzuru really win against the married Daisuke?

Mine the translator and Anjo the bus driver are friends. Mine is awkward and hard working, while Anjo is friendly and has a girlfriend. They're very different from each other, but they quickly became friends and feels a strange sense of distance between them.

From Lezhin:
The school's fastest track star, Namsu. An old friend from the past, Hye-Yeon. Everyone's adorable sweetheart, Joy. High-school romance at it's best! The comic that made Pito one of the best in the GL genre.

The next instalment of Alien 9.

This manga follows the story of 7 high school students, 3 boys and 4 girls in year 1 class A. Their not-so-ordinary ways of thinking and everyday lives are loaded with comedy, dirty jokes. At times, debating about how to use a toilet, at other times, risking their lives over growing body hair in unusual places!

Oota Katsuyo is a 15-year-old girl just entering high school. She's short and plump, thanks to being the daughter of a family that runs a tonkatsu shop. She's followed her crush from middle school to the same high school, and she's devastated when she finds out he's not interested in chubby girls. As she's looking for ways to lose weight, the free-spirited president of the swimming club, Itou Hatsume, and her serious and demanding vice-president, Kaji Rinko, are looking for new members to supplement their roster of two. When Katsuyo meets Kaitani Ayumi, a rail-thin girl with an appetite that matches her own, Ayumi drags her to the swimming club to join up. Will Katsuyo have problems measuring up to the demands of the swimming club, or can she make a big splash?

A demon sets out to create an all-girls harem of girls to impregnate and save her species from extinction.

Crossover between Ore Monogatari!! and Nisekoi.

The manga was released by Taku Kawamura @kawamurataku on Twitter.

Okada Kenzou, 60 years old, is fired after a whole life spent on working and his wife and children leave him without money. He tries to commit suicide in the forest by hanging, but the branch and rope snaps. After seeing the sunrise, he decides to live a new life in this forest that didn't let him die.

After 3662 blind dates, the 160-years-old Headless King of whom everyone is afraid is finally getting married! But the King keeps hiding from the cute and gentle Princess instead of meeting her face to neck. So how can the Headless King and the Princess get to know each other?