A seinen manga from 1979 (R-18)

Masaki Masamichi has his heart set on joining the legendary manga club of Takidani High School. After all of his effort to get into Takidani High School and prepare for his club entrance, he finds out that a horrible change has happened to the club of which he dreamed. How will he cope with the disappointment of learning that his long-awaited club life consists of drawing ero-manga?

Description Based on the Dragon's Dogma video game, this manga series is about the adventures of the Arisen Karol and his main pawn Elise. Karol's simple life as a fisherman changed when his home village of Cassardis was attacked by a dragon, who then proceeds to consume his heart, marking him as the Arisen. Now he seeks to reclaim his heart and along the way, he learns more of what truly makes an Arisen and of the mysterious Pawn Legion.

From Seven Seas:

Tor Kokonoe has entered the prestigious Koryo Academy, a high school dedicated to training its students to wield Blaze―individualized weapons that a student manifests. The future of a student is often shaped by the form their weapon takes, and when Tor’s appears as a shield, suddenly he’s the odd man out. But that’s when the Duo system comes in, a program where students are paired up. Teamed up with a silver-haired girl named Julie Sigtuna, Tor’s adventures at Koryo Academy are just beginning!

A gullible girl, a troubled adult, and the God that watches over them... The heartwarming chronicle of growth between the three of them as their daily lives entwine.

The young adopted Mi-Chan, confused by a town she is not used to, encounters the adult blacksmith craftsman, Ken, and the smithy’s God, Kitsune. This encounter will help her heart grow. Though, this growth will also become the flames of change to both Ken, and the God, Kitsune...

Thomas dreams of becoming a knight and is thrilled when he is admitted to the famous Walst School of Knights. There he meets several interesting characters, such as the free-spirited Bernard and the school genius Hermann.

Two decades ago, the dragons returned to earth. Soaring above the skies leaving behind trails of destruction. They attack humans for the simple reason, their destructive impulses. In order to fight the dragons, humanity acted. They began to dabble in magic...

A girl named Iwase Maho moves in with a family friend to make the commute to her high school easier, but something is off about her...

Japan is a seismically active country, so the occasional trembler isn't anything that people get too worked up about. They happen and it's unfortunate, but in general Japan is prepared. But there is one scientist who believes that he has found proof that a recent quake has triggered a cataclysmic event, and that within a year Japan will sink into the sea. Now if he can get anyone to believe him before it’s too late…
Also known as Japan Sinks, this is based on the award-winning novel and movie of the same name.

Tohru Fujisawa attends AKB48's 19th Member Selection Rock-Paper-Scissors Tournament held at the Nippon Budokan on the 21st September, 2010 and draws a one-shot from his POV as part of the AKB Observation Section. Titled Repoman Soul!, it showcases the soul of the fans at the AKB48 event!

From MangaHelper:

In a land far away, the evil demon lord ruled with absolute power and cruelty. But a group of heroes combined their strengths and conquered obstacles to finally reach the demon lord in a final fight. When the sorcerer cast the imprisonment spell that was supposed to trap the demon lord, it also dragged all the heroes into a different dimension.

The demon lord, who looks and acts like a teenage girl, has lost her legendary powers and is forced to rely on the heroes to find a way to escape the prison. The sorcerer, who is leading the search on how to break out of the spell, can’t help but to tease the now powerless, bratty and emotional demon lord that once was a threat to the entire world.

Kouki and Shiori are high-school students who fall in love for the first time in the month of April among the dancing sakura; but their experience with these new feelings is as tentative as the slightest wind of the changing seasons.
Even so, never a day goes by that isn't stirred by their first love. The scenery they view from inside the Ferris wheel, walking on the streets together through the rain?in this fashion, the red thread that ties these two together grows stronger as time passes. This is the story of how they live their lives through the first six months of their relationship.

From Sura's Place:

Money, lust, and desire for powers. None of that is needed for a man whose importance is as small as a gallbladder. However, if a man wants true peace of mind, he will need to have those.

In the story, the main character is on the way back home from being rejected by a girl when he finds and picks up a high school girl who has been abandoned on the roadside.

From MangaHelpers:
At school, Kamazaki Yuu feels as though there is a circle drawn around her, a line that no one will cross. A part of it is because her face looks mean, and another part of it is because she's rather socially awkward, but the largest part of it all is that she has earned a reputation for being really bad-tempered and violent to the people around her.
This all changes in her second year of high school.
The cute, friendly, and popular Kume Asami one day inexplicably crosses that invisible line and decides to be her friend. Kume introduces "Kama-chan" to friendship and to the 5-man futsal club that meets on the school roof. As Kama cautiously enters Kume's club, she may find herself able to grow past the bad expectations people have of her, and enter into a new, happier, high-school life.

A deadly virus is spreading across mankind, turning humans into gruesome monsters known as ‘Kanshu'. Yet no one knows of their existence, except for the organization called ‘F.L.A.G.', dedicated to hunting down and destroying the source of the infection. Its members possess extraordinary powers, capable of unleashing righteous fury on their enemies.
One day, a cell phone message from a dead relative leads estranged youth Riku Amami unwittingly into the conflict between F.L.A.G. and Kanshu - and to a mysterious cocoon that would change his life forever, for better or worse…

Hikaru Onuki is a 22 year old girl whose hobby is to cook homemade cuisine in order to find a boyfriend. But for some reason, no matter how hard she tries, she is unable to find one.

High-schooler Shiina Shinya thinks that all girls are pretty much good-for-nothing, mostly because he doesn't understand them at all. That doesn't stop him from being surrounded by strange girls.
Tsubasa Tooka, a cute, much-admired girl, stalks him. Shikimura Masami is majorly into masochism, and has recruited Shinya into her play sessions. Ikari Satsuki seems suspiciously interested in the recent serial stabbings, and seems to want to drag Shinya into it. Banjou Yoruko, a normally quiet, bookish girl, has decided she and Shinya are bound up in some fantasy setting. Uchida Yumeji is the school's sleeping beauty, who spends all of her time in the infirmary because she requires so much sleep. Shinya brings her newspapers, so she can keep up with current events in the short time she spends awake. Lastly, Okui Akane is convinced she is a vampire. For all Shinya knows, it could be true, but in practice it just means that he has to let her drink his blood.
How will Shinya deal with all these good-for-nothing girls that complicate his life?

From: Easy Going Scans

The story begins to unfold in 900-960 AD, later Zhou dynasty, when Chi Wu is being imprisoned after purposely losing to the emperor. His true goal lies within the prison itself, a clue to the whereabouts of world's greatest lost treasure-- Qi Lin Treasure. The words of his capture quickly spread to the ear of his senior and a former officer of the imperial court. Tie Zong Heng (Lawless), decides to be re-enlisted to the imperial services just to hunt down Chi Wu.