In the Ero Ki series:

V.1 - Junai Ero Ki
What do animals do in the spring of their lives? They mate! Wildly!

Four mischievous friends have met their match: their own hearts! Now that they're older, the only troubles these country boys find make them moan and pant. Kou-chan wants to confess to Kishi, but he’s full of heart-pounding doubt over Kishi s response. Mitsuru, the serious boy pining for a lost love, is ambushed by Tarou, an obtuse, air-headed sadist, full of devotion for his darling. And who is this tall boy, beating everyone up yet shooting flowers out of the panels? Somebody needs to figure out his body language.

Psyche Delico comes out to play... all over the pages of PURE LOVE’S SEXY TIME!

V.2 - Souai Ero Ki

They may be in relationships and having sex, but boys at puberty have a lot of problems to solve!

The long-awaited sequel to the fan favorite series Pure Love’s Sexy Time is here! Kou gets frustrated with Kishi for being too gentle with him, Satoshi and Eishou have trouble finding a way to walk the same path to their futures and there isn’t enough verbal communication between Tarou and Mitsuru while they become more and more physically compatible… Where will these boys’ paths lead them?! The final conclusion to a Pure Love’s Sexy Time. (DMG)

Misaki is a 30-year-old virgin who has a bit of a crush on one of his co-workers, a pretty girl named Amano, but he has no experience and no clue what to do. Fortunately for him, he has an ecchi guardian angel…

Hayate and Choko are twins who are as different as night and day. Choko acts like a shallow princess whose main concerns are her looks and cute things, while Hayate is the cool but overprotective brother with a penchant for sabotaging potential relationships for Choko. Naturally, Hayate plans to act accordingly when Chouko confesses to the school's prince, Tsukiyono (albeit, mainly for his looks).

After an argument over Choko's love life, Hayate and Choko end up tumbling down some stairs together, and bizarrely find they've switched bodies. Even worse, and much to Choko's horror, Tsukiyono starts to fall for Hayate who is now in Choko's body.

From Fantasyshrine:

1) Boss' Favorite
Sakurai is a new hire who is having a secret relationship with his boss, Chief Akimoto. Even though the chief is gentle, suave, and unexpectedly, a pro when it comes to the H-department, he’s still an “old man” in Sakurai’s eyes! However, Akimoto sees right through the rather naive Sakurai and spoils him to the point that keeps him demanding for more… until they both come to regret it!

2) Secrets Under the Suit

3) Until There's Love

4) Cat Lover

5) Butterfly and Flower Lovers

6) Secretary's Choice

7) The Favorite Subordinate

Tateyama Sukai has just transferred into a high school filled with "princesses" from wealthy and influential families. In her search for club activites that appeal to her love of physical activity, she comes across a mountain climbing club, and finds herself drawn into the world steep ascents under the open sky.

Despite being in 3 clubs and 2 commitees, upperclassman Sasaki won't say, "No," no matter how often he's asked to help out. As popular and integrated as Sasaki is, antisocial Ikuzo is out on the fringes, never joining in, yet for some reason this odd loner follows Sasaki around like a lost duckling. So why is it when Ikuzo pushes closer to an uncomfortable Sasaki, Sasaki just can't seem to leave him alone?

"30,000 residents of the Northern Kelko plains were vaporized by the Kiyania bioweapon sprayed by the terrorist group Echiboza. 30,000 cats remained in their place. However, one person escaped this fate; a girl saved by a stranger with a gas mask.

Her name: Kaka Hollen."

In this strange new world, terrorism, crime, and corruption have found a new target in the feline kind. Enter counter-terrorism squad 'Green' and their all-purpose humanoid weapons, the 'OB's! But what role will Kaka play in midst of all this?

Chu Ming Yang is an extremely unfortunate high school student who accidentally enrolls into an academy of a dubious nature, where it is the norm to jump in front of moving trains, get dismembered during orientation, and crushed by vindictive bouncing classrooms. Can he stay alive or will he die from the rigors of school? Why have evil spirits suddenly acquired a taste for his flesh?

1) Kanbe is in love with his boss, Tatsuya, who is sexually harassing him, so he decides to visit a fortune teller. Will the fortune teller be able to help him?

2) Tatsuya takes Kanbe to a high class party where they meet Kazuki - Tatsuya's old student from when he was a tutor. Kazuki might look young and innocent but the truth is that he's a little devil with a sweet face and now he's dying to nail Kanbe! Could this be a threesome?

3) When Kanbe negotiates a contract with another company, the handsome manager has one condition before accepting the contract- Kanbe must sleep with him! What will Tatsuya do when he finds out about this indecent proposal?

4) Homeroom teacher and nice guy Tokunaga agreed to go out with his slacker student Mochizuki if he will start being more serious about school. One day, Mochizuki overhears Tokunaga talking about him with another teacher and it looks like he's not such a nice guy after all?! What will Mochizuki do?

5) Shibata Keigo, a top who likes the "young, short and cute" type, finds himself attracted to Saiga Naoki, his subordinate at work. Saiga is not really his type- he's beautiful, tall and older than what Shibata usually goes for but it looks like Saiga has a crush on him and even asks him to accompany him on a business trip! Shibata agrees but he's in for a big surprise when the two finally get into bed.

6) Saiga discovers that Shibata has been fooling around with cute young guys again. Punishment is in order!

7) It looks like Shibata can't help being attracted to cute boys. Saiga has some plans to settle this once and for all...

Kanadegumi follows a girl named Miyabi Neko and her interactions with five attractive young men. The story takes place in Tokyo and centers on an imperial opera company named Kanadegumi.

From Phoenix Serenade Scans:

A story set in the Taisho Era. Meet Miyabi Neko, a girl with bad luck from a small place called Izumo, who aspires to become an actress by joining the capital's most popular acting group Hanagumi! And after some hard work, she was finally accepted into Hanagumi! But, when she reaches the capital, there is some disturbing news. Apparently, she is not to join HANAgumi, but the capital's music group KANADEgumi! And she meets some strange but handsome young men on the way? What is Neko's life going to be like in the capital?!

Socially awkward Aono was perfectly happy working in Quality Control but as fate would have it he's been transferred to the Sales Department?? As if being ridiculed by his co-workers for his nervous stutter isn't bad enough, he's thoroughly mortified when the departmental star Gouzaka overhears him having a breakdown on the roof. But no matter how often he pushes Gouzaka away or how fast Aono runs Gouzaka is always there by his side... Has this timid frog finally found his Prince Charming?

Published also as "Kaeru No Oujisama"

The strip is about a Manila community of mostly obese people - "fat as pigs", so to speak (baboy is Tagalog for pig).

This manga deals with the history of a teenager, Tobi Shima Sen, who lost his father and lives with his mother. He is a scrapper but his mother has no authority over him. In order to educate him, she decides to send him to a kickboxing coach during the holidays/vacation.

The beginning of a love story set in a school for eccentric artists. Kei Onodera, a college student majoring in science starts working part-time as a lecturer at an art prep school. Immediately, he catches the eye of the rough and wild sculpture teacher, Higa Rikimaru!!

From Baka-Updates: Ineffectual high-school teacher Kakenshi catches his (male) student Nakamura using school computers after-hours to make naughty crossdressing webcam shows. Kakenshi persuades Nakamura to stop, but only because Nakamura has a new hobby: seducing Kakenshi! Will Kakenshi surrender his heterosexuality and give in to his cute crossdressing student's affections? An ecchi rom-com aimed at crossdressing fans, from the boys-in-skirts (otokonoko) magazine Oto?Nyan.

Taglines:

Do you want to know this transfer student's secret?

Are you going to fall in love with the world's most cheerful little girl?

Tomas has a very very hard sucking life. After years of humiliation from two bullies from the school, he finally has his give it back: he calls a number that offer a service of 'beating bullies for money'. But the dumbass dials the wrong number and the call goes to a expert and pro assassin's agency. And thinking he's calling right, Tomás gives all your personal information and makes the deal. Then Jack, a clumsy weird assassin comes to 'protect him', making sucker Tomás' rotine a little more suckered...

Jutten! is about a boy who goes to his first day of high school, thinking it'll be full of awesome (pervy) meetings with sexy girls and whatnot, but instead has a lot of bad luck and gets peed on by a dog--amongst other things. A girl who uses her bike to drive over his ass sorta helps him and gives him a handkerchief with a 10 yen coin in it (hence the the serie's title) and ... very plausible stuff happens afterwards.

Horiguchi Genki was a 5-year-old boy. His mother died when he was born, and he was raised only by his father. His father, Shark Horiguchi, was a professional boxer, but he was ruined and became an itinerant boxer. However, Genki believed his father was strong and he would become a champion, and he had a dream to become a strong boxer just like his father.

After his father’s death, he was adopted by his grandparents. Although they opposed Genki boxing, Genki made up his mind to become a boxer, and he continued training secretly, by meeting with various people.