From Viz:

Yuji has just started a new semester of high school and everything seems to be normal. That all changes when a mysterious man named Friagne begins turning people into blue flames. And wouldn't you know it? Now he's after poor Yuji!
To the rescue comes a girl named Shana. But is she too late? As it turns out, young Yuji may already be dead. What the heck is going on?

Katsuragi Keima is known on the net as the god of getting the girls while in real life he’s known as otamegane and he hates all real girls. However he is approached by Elsie, a devil from hell, to help her in catching runaway spirits that hide in people. Apparently the spirits only hide in the hearts of girls and the only way to get the souls out is by making the girl fall in love so the spirit gets forced out. And he’s not allowed to fail or he will lose his head.

From: Easy Going Scans

Our protagonist Jo Cheul-Hee is a delinquent who enjoys picking fights and aims to take control of his new school where he gets transferred, but what he doesn't know is that it's an all girls school.
Being the only male student there, everyone thinks he is gay!

Kurosaki Sou is a 16 year old who summons a devil to take his virginity. He hopes for a devil with flaming red hair, large horns, and black wings. He gets exactly what he wishes for, although he forgets something else rather important. Now he’s forced to live with this devil and has to think of a way to get rid of it, and most importantly – survive its lust.

1) Love Making
Student Shinobu loves cafeteria food and usually cleans his plate, the only thing he won't eat are carrots. When school nutritionist Tatsuya catches him throwing out food, he has to think of a creative way for Shinobu to eat his vegetables...

2) The Pigheaded Deity
Keisuke's grandfather always warned him about the Tengu living on the mountain, but that was when he was a child. Keisuke's an adult now, so why is he seeing a handsome man with wings?

3) Let Me Drown in the Sea of Love!
Atsushi is a failing romance novelist whose active fantasy life has wrapped itself around fish shop employee, Sakurai. Can Atsushi wake up long enough to make a move?

4) God, Give Me a Wife
Kurachi Daisuke is a high school teacher with a problem: he's single. So he prays to the heavens to give him a wife, when a passing alien hears his wish and decides to help, Kurachi may have to think a little more exotically about him love life.

5) The Kind Hearted Roommate / Oshikake Hunter
Dorm head Hiroki never expected Kenta to come to his school. Hiroki always treated Kenta as a younger brother, but Kenta's feelings were far from brotherly, and he's not going to let Hiroki slip through his fingers again!

6) Dealing with Fate!
High school student Tetsuya has a really bad memory, especially first thing in the morning. This leads to a mix-up on the street and Okada Aki enters his life.

7) Diary of a Fantasy Life!

8) Love Making II
Tatsuya has started a new job at a college and Shinobu is lonely.

A box that grants three wishes might seem like a dream come true.
At least that's what Keita thought, but inside the box he finds a girl. And this girl is no genie--Maki's a devil princess, and she's come to take Keita's soul! But she can only take his soul after he makes his third wish.
So, as a sheltered demon with little knowledge of how to be evil, Maki must rely on her trusty guidebook to teach herself the ways of the nefarious arts and trick Keita into using up his wishes. Until then, Maki's going to live with Keita until he can't stand living anymore.

The story set in the contemporary South Korea. Some 30 years ago, unidentified creatures appeared out of nowhere and have attacked people. They have caused massive destruction wherever they go. The monsters are called "Trouble"s, and get the world have fallen into chaos. Along with the first appearance of the "Trouble"s, some number of humans were born with or acquired supernatural abilities. These mutants called "Trace"s are the only ones who can fight the "Trouble"s. The "Trace" are also considered freaks and generally shunned by the community because some of them misused the powers for their own interest. The plot revolves around two main characters. Sa Ghang-Gwon, a high school student born as a "Trace" who attempts to hide his ability. The other is Kim Yun-Sung, who acquired his "Trace" abilities during his early 30's. Webtoon from Daum

Yurie Hitotsubashi was just an average middle school student living in the city of Onomichi on Japan's inland sea. She spent her days worrying about exams and trying to get Kenji, the clueless boy she likes, to notice her. Then during lunch one day she suddenly announces to her friend Mitsue that she had become a goddess the night before. Their classmate Matsuri quickly latches on to Yurie's newfound divinity as a way to promote her family's financially struggling Shinto shrine. She hopes that in replacing Yashima-sama, their ineffective local god, with Yurie, it will make the shrine more popular. Now all Yurie has to do is figure out what she's supposed to do with her power.

A guy with a weird creature on his shoulder and a wand in his hand saved Kureba Masaki, a ceo of a branch company, from falling off a bridge, and forced a condition of "partnership" over him... a nightmare right? Right?!

The class is in a turmoil when Fujimiya Satoru suddenly transfers to their small high school at the bottom of Mt. Kamio. Why did the beautiful daughter of a distinguished family choose such a rural facility? But more importantly, what will become of the wolf boy who confessed to her on her first day at school?

Amagane Rinne, an up-beat schoolgirl, has died. Even though she is dead, she still has to go to school. But if she's dead, where would she go to school? In Hell, of course! But making friends in a school filled with demons isn't as easy as it sounds....which it doesn't sound...anyways, with dark artwork, and cool characters, this manga is a must-read!

From Wikipedia:
Usagawa Rinne, a normal female high-school student, spent happy days with her lover, Sakaki Guryuu. However their peaceful days were suddenly shattered. On the night of Sakaki's birthday, Sakaki witnessed Rinne's death after her eye was gouged out by a girl named "Gankyuu Eguriko"...

18 years ago, a powerful monument was discovered on a mysterious island. The momument contained data only certain people could extract – who became students of the island’s school. By being able to extract the data, the students are able to summon a creature that they fight with. Of these people, Satou Taketora is your typical lazy kid who doesn’t do anything, hence he’s ranked dead last. But one day, he’s dragged into a battle with his old childhood friend, and to everyone’s surprise… his summon is more than meets the eye…

From Antisense Scanslations:
Nana has lost all the crayons to her store along with Monkichi! Each chapter title is based on the game Shiritori and the theme of the chapter is based on the title which helps Nana find her crayons and Monkichi.

Shiritori is a Japanese word-game which involves taking (tori) the syllable from the end (shiri) of a word, and thinking up a new word which starts with that syllable. One English name for this game is "word chain." If you want to try it out, you can even play online in English at http://shiritorigame.com/

In this manga, the dialogue itself doesn't use shiritori, but the chapter titles do. So the first chapter named "store" or "mi se" in Japanese, leads into a second chapter named "laundry," which is "se n ta ku" in Japanese.

When Shin hears about a doll known as the "bloody doll" from his friends, he can't help but be curious. Instantly falling in love with the figurine he decides to buy it, but there are rumors about the doll and how it got its name. It can supposedly move and talk, one owner even claimed that it drank his blood.

Unfazed, Shin buys the doll anyway to find out that the rumors might not be as ridiculous as they sound...

The story set in Heaven, except it's a corporation with a hierarchy. There are gods from the major religions, and they're all discussing to wipe out humankind (again) when suddenly! A human girl enters. What will happen? What about the end of the world? -[Easy Going Scans]-

Civil engineering student and reknowned bridge otaku Youichi helps a swan stuck on the scaffolding for a bridge under construction, only to be visited that night by Miwa, a beautiful woman claiming to be the same swan Youichi rescued. Miwa stays with Youichi in order to pay back her debt, but he is, understandably, less than convinced that she is what she says she is. But, Youichi not being one to look a gift swan in the beak, or more importantly not one to leave a woman in need hanging, things soon develop in the way you might imagine.
(Then again, maybe not exactly like you imagine...)

My boyfriend transformed into me…

Side story of Get Backers created two years after the conclusion of the main series.