From MangaHelpers:

Takahashi Ena is a high-school idol with a secret hobby. She often wears headphones, and people assume she is listening to music. In actuality, there is no music playing; she is eavesdropping! She prefers to listen to two of her male classmates, Nara and Mikage, because they have the most interesting conversations. She has to be careful to not be found out, though, because a creepy hobby like that could ruin her image! [tethysdust]

Nao's new home tutor is none other than Akio-niichan, who used to tease him mercilessly when they were little. Nao is completely helpless against Akio, feels strange when around him and can't concentrate. That's when Akio comes up with a proposition: "if you get the next answer right, I'll make you come..." Nao's heart-pounding day have just begun!

From Aerandria Scans:

Noriko is caught up in an accident while she is going to her track and field competition. When she opens her eyes, there is the young doctor Shinoda who seems very concerned about her. She is attracted to his child-like smile, but from his lips, she learns a shocking truth - in the accident, Noriko has lost her physical body and what remains is only a brain, stuck in a little black box?!

Note: The side stories in volume 1, 2 & 3 are written in novel format.

From AQUA Scans:
The Thousand Years Labyrinth, a whirlpool of mystery and intrigue, Does it show despair or hope? One day, brilliant young men will be gathered at the Thousand Years Labyrinth. They thought that the ceremony to select the next emperor had started but...

From Midnight Scans:

Kureha Mimachi, a 15-year-old girl, has just transferred into Shiritsu Kenhono High School. However, there is something weird about this school, it is actually a school where the Princes and Princesses of the beast-kind go to!

Even though Kureha is human, she is there as a way to help the students lead their lives peacefully with humans and has the role as the "rabbit". Will she be able survive without being eaten by the students? Only time and her hidden bodyguards will be able to answer that...

Hououji Yuu is a high school closet otaku, and is also the sole heir of the very rich Hououji family. She needs to keep her hobbies secret from others because that would end up ruining her family name. Because of that, she has always kept her distance from maids. Until one day, she meets her personal maid Masaki, who happens to be her favourite doujinshi artist!

Accompanied by a talking lantern, Mika pursues her sister on a quest to retrieve that which was stolen from her long ago.

Struggling manga author Satoru Fujinuma is beset by his fear to express himself. However, he has a supernatural talent of "noticing things" that forces him to help people.

Boku dake ga Inai Machi Gaiden

N/A

A story about a boy who is able to talk to the Gods.

Meedan Kang is the last living descendant of a powerful witch that placed a curse on the Montrose family many years ago. She's desperate to live a normal life but suddenly two handsome men, with ties to the curse, enter her life with different plans for her. Their presence forces Meedan to confront her family's past and the abilities within herself that she has resisted for so long. As the three of them try to face the curse that binds them all together, a love triangle begins to complicate all of their plans.

Beautiful women are being targeted and horrifically killed by an unknown assailant. Cries for justice keep pouring into the police department, but the team assigned to the case is not even close to catching the evasive killer.

Just as they're at their wits' end, a reclusive young man with a mysterious ability arrives and offers the investigators his assistance...

The Freezing Pair Love Stories manga tells the story of how the various Pandoras and Limiters met. The first chapter focuses on the characters Ganessa Roland and Arthur Crypton.

Arisue Sei lived as happily as any normal kid would, just him and his mother -- a particularly private woman -- on an outlying island of Okinawa. There were also his friends Toichi and Moichi. The only unusual things about Sei were his sharp instincts and high intelligence. But everything changed when his mother was killed and he was kidnapped by the people of Neo Genesis. Now, six years after the kidnapping, Arisue Sei has returned to Japan with the title of "Doctor" at only the age of 18, and he's not the Sei that his friends remember. There are bodyguards with him who protect him from others who wish to possess his superb intellect. He says he's come back to assist with the research at Rakuhoku University, where Moichi now works, but here is where the door to Sei's secrets just begins to open.

Nostradamus prophesied that the world would end in the seventh month of 1999. Today is July 21st, 1999. Ever since she was little, Maruyama Sakura has put her faith in this prophecy, has believed she will die at age 19. Consequently, nothing has seemed all that important to her. As the final days of her final month tick down, Sakura is whiling away the last of her time. Then Sakura meets Mori. Sakura has ten days until the end of the world.

In this heartwarming series, Hana stumbles upon Cafe Requiem, a special place where the spirits of the dead still linger. Each soul has a story, everyone has a final wish. By helping them, Hana finds another side of herself and those around her. Is Hana's special ability to see the dead a curse or a gift?
- TappyToon

Official Translation
Original Webcomic

Since the beginning of time ninjas have been regarded as people with great skill and power, the Blazing NinjaMan (Shinobi Mantaro) is one such young man. There is only one problem, the era of the ninja has come and gone. How can Shinobi consider himself a ninja in modern day Japan (1990s) and survive the daily rigors of high school life.

From ShoujoMagic:Ryou has the biggest breasts of any shoujo manga heroine to date! But life isn't any piece of (cheese) cake, because she's constantly being assaulted by perverts who want to cop a feel. The first man who doesn't obsess over her assets turns out to be the first man she ever wants to have obsess over her, though there's something strange about him... One time she's with him, he's a sweet masochist, the next time he's a bold sadist. Which does Ryou like better? The S or the M? She'll have to make a choice, because it turns out that she CAN'T have both. Find out the surprising reason why one face has two personalities!Includes short stories:Volume 1:Gattsuiteke! - It's Unintentional!Chinatsu has liked her guy friend, Shinnosuke, who she fights with allot, for a long time... Will she be able to be together with him when there's another guy confessing his feelings right in front of him?OnlyA sort of prequel about Masaki and Shingo when they were younger, but mostly focuses on Shingo because he's the more troubled one.Volume 2:Prince of SummerNozomi-chan's got two of the school's most popular guys, Ken Tamae and Kaname Yuuki, confessing their love to her at the same time... What's a girl supposed to do when her world is suddenly so confusing? Especially when she used to wish that she could get her hands on one of the two...Volume 3Shiitake - The Mushroom GirlKeiko Shita sees herself as a dark person, and so does everyone around her... But what if that could change? What if the popular boy, Teru Hinata, could change that?

From Tokyopop: Mikako, our over-zealous heroine, has a sister-complex so strong she won't let just any man wed her sister. On an undercover investigation to learn more about the newest bachelor, she ends up moving in with him! Plus the guy is a highschool kid just like her! Mikako's relationship with him starts to grow. What'll happen between Mikako and him?!

I love math. Just after the high-school entrance ceremony, I meet a beautiful girl: Milka. Milka is a mathematical genius. She shows me many math and many elegant solutions. Milka and I spend a long time discussing math in the school library.

One year later, I meet another mathematical girl: Tetra. Tetra is one year younger than me, and asks me to teach her math. While I teach her, she begins to understand math and gradually to love its elegance.

The third series is about logic puzzles, Peano arithmetic, epsilon-delta, Cantor's diagonal argument, Hilbert's program and Gödel's Incompleteness Theorems.