A collection of strange horror stories in the vein of authors such as R.L. Stine, from the master of absurdist horror, Takahashi Yousuke.

From Evil Flowers:

They say the world is going to end in five days. Now what to do until then? Follow Fuji, Touko and Nitaka on their last school days preparing for the end of the world. Meanwhile, Niino, a clumsy devil, announces that she’s going to destroy the world in five days from now. The hilarious chaos is complete now.

When a mysterious so-called meteorite crashes, a group of students gather to go and investigate it as part of their club activity. Low and behold, the meteorite is actually a futuristic, high-tech supermarket! What comes after is only weirder and weirder as they encounter more things that are out of this world. Follow these students as they go on supernatural adventures!

From Horobosu Scanlations:

"Seriously, I'll finish you within three hours."

That's what Kirishima Haru had in mind when he entered the virtual world of a dating sim. Haru's had it all since childhood - looks, charisma, good grades, athletic talent and girls, but in this virtual world, Haru would meet the only thing he wants and unable to attain. At the edge of the incomplete world, the love story of a player and a NPC unfolds.

Yuuki Tsumire was raised by her single mother, who always told her to keep smiling, no matter what hardships she endured. The two of them were a family, until Tsumire's mother died from illness.
Tsumire soon learned that she had a family she knew nothing about: a cold, rich family that disowned her kindhearted mother when she became pregnant. Tsumire now must go live with this family, even though none of them seem to want her there. She doesn't have to switch schools, so she at least has her friends to help her through this difficult time. However, she doesn't have the heart to confide in her friends with even more problems, so she tries to keep it bottled up inside.
To her surprise, the Yuuki family lawyer, a young man named Hino, soon becomes her emotional support in this difficult situation. However, Tsumire's reactions to him might mean that she wishes he were something more.

From MangaHelpers:

Aizawa Katori goes to a school with an unusual rule. The nearby, separate school building is full of elite male students, and the school wants to prevent any of the female students from getting involved with them. For this reason, all the girl students are required to wear masks! Katori wears a horse-head mask, but she hasn't given up on getting through to her long-ago childhood friend and crush, Shinra. Shinra also has a crush on Katori from when they were children, but he does not recognize her as the strange horse-headed girl who speaks to him! [tethysdust]

The Kirionira are the demons that live in another dimension and invade the human world through people's dreams. The only defense humanity has against the demonic assault are the hunters who rely on their sex drive as a source of power to fight against them.
Riku Yoichi came from a long line of hunters and had high amounts of sexual energy which allowed him to be a great hunter. He moved away from his home town after middle school to demolish the Kirionira and was successful in finishing off the king and ending the battle forever. However, the peace came at the price of Yoichi losing his sex mojo.
Returning back to his home town, he soon learns that the demon invasion was not over, but without his sex drive, he is helpless to fight back. He tries convincing his childhood friend Namba Midori and her female classmates to get him sexually aroused, but they want nothing to do with it.

Chie had always tried hard being a student vice president at school for the sake of her crush that is the student council president himself. She is currently a third year and is on a brink of graduation, so her goal is to ultimately confess to him. While she is busy working within the last days as the vice president, she particularly gets closer to a certain kouhai. Will Chie be able to confess before her days in the student council is over?

From ryColaa:

There are mysterious masked-men trying to conquer the earth!! And to defeat them, the state started a project team called 'Rebirth Knight'.

Kang Chan, one of the strongest high schoolers, meets a girl named Chaewon and falls in love at first sight. However, Kang Chan hears from Chaewon that she is a member of the Rebirth Knights, and decides he wants to be a member too...

From Senpai Scans:

"Girls who like to lie, come to my salon." Arisue Rio firmly believes in the principle that "the outside is the most important." When she says that to male nail technician Nojima Yoshitsuki, he puts a specially made, cursed gem on her nails and told her: If you kiss a boy you don't like, then time will rewind.
Rio didn't believe it but after being confessed to by a suuuper cute kouhai, they started dating and kissed! After they kissed, time rewinded to the day before?!

The child-like Hatakeyama Tsukushi returns to her hometown to attend high school.

Orginal webcomic

The daily lives of an extraordinarily jealous (yandere) girl, Hiyori Koharu, and her boyfriend, Minoru Fujito Original Comic: http://www.pixiv.net/member_illust.php?mode=medium&illust_id=44979493 Motion Comic: http://mcs.ensoku.club/con/965?from=rankingBox&culture=en_US

The manga adaptation of the latest RPG in the Persona series from ATLUS: Persona Q: Shadow of the Labyrinth. One stormy autumn night, the P3 gang is bummed that Gekkoukan High School's Culture Festival was canceled due to the weather. But out of nowhere, they hear a bell begin to ring. The next thing they know...

Unlucky Himari Kawashiro, a shy and awkward high school student, only wants to be accepted by her peers. While trying to organize her school cultural festival without much luck, she accidentally stumbles upon a serious-looking cat eating cookies in an empty classroom. While fangirling over how cute it is, it transforms into her (now naked) classmate, Sennojou Shionji. He recruits her to be his sugar-toting assistant...and thus begins their odd partnership.

From Fujoshi Bitches:

You’re asking what we’re deciding?

Of course who’s gonna put it in first.

The super normal university student, Hiroo Eiji has a problem. That is, he can’t become popular because he always has two extremely handsome but forceful childhood friends, Haruki and Ikumi, besides him. However, when he received the first love letter in his life, he got confessions from both of them saying, “You can’t go out with a girl. I’ve been in love with you all this time…” and then they set him up and do super perverted stuffs with him…?!

The popular life of a normal and suffering boy who’s being doted on by his two childhood friends❤
Plus, there’s also “Shut up and let me eat you.”, a story between a super herbivore subordinate puppy×super carnivore + seme-like senpai. Extra and drawings are also included♪

From Shoujo Manga Maniac:
Suzuno is able to transfer to a new high school on one condition: She has to manage a dorm nicknamed “The City of Crime,” where all the residents are troublemakers!

Includes two other stories:
• Ecchi no Ojikan (Erotic Times)
Shizuku wants to do ecchi things with her older boyfriend, Katsuki. He agrees if she can score above 80% in all her exams. However, Shizuku still worries that he sees hers as a little sister..
• Shounen Kakumei (Boy Revolution)
Chitose is a 12 year old boy who has a bad habit of sexually touching girls. He works in the same company as Aya's mother. Due to circumstances, he and Aya will be living with each other over spring break.

"Now, he is in love". Collected short stories from the male point of view.

1. Mizuiro Hanabi
2. Kokuhaku
3. Ato Hitotsu
4. Bokura no Seiza

From Nagareboshi Manga:

Kitazono Meiko falls asleep in the library one day, only to be awakened by a kiss! She is unsure of who it was that kissed her, however, since there are multiple boys still in the library. Could it be the popular boy Shinoda-senpai? Or the super-cool Mikoshiba-senpai? The boy-next-door type Mogami? Or the cute underclassman Hachiya? Who could it be? They're all possible candidates, but which one does Meiko like the best...?

Oneshot in volume 1:
Soprano (released by Ouiratsuike)

Oneshots in volume 2:
Anna no kami ga nagai riyuu (released by Sound of Jewels)
Hakka drops (released by Sound of Jewels)

From Animexis:

The new title of Kosuke Fujishima, the creator of Ah! My Goddess. Paradise Residence is about the battles in the first dormitory of the Kikka Institute, where the dorm mother is a grade school girl. The main character is Hatsune Takanashi, a student at the Kikka Academy girls' dormitory. She's active and straightforward, has trouble waking up, hates natto, and one of her main three urges is the lust for conquest!

During the early 20th century, along with technological advancements, scientists were able to develop sophisticated magic. The combination of science and sorcery was Makinot, circuits made from spells that were put into objects to bring them to life and even gain a personality. It was developed as a military weapon and has now spread throughout the world. Akabane Raishin is now attending the Royal Academy to become the best in the world. Accompanied by the lovely teenage girl Yaya, who is actually Raishin’s puppet weapon, he plans on rocketing to the top of the class. However, his test scores come nearly dead last although his combat skills and determination are second to none. Raishin has to compete with the deadliest of classmates if he wants to come out as the king.