One day, a high school boy named Rumi comes across an abandoned, decommissioned tram car, a place that could make a neat 'secret base.' He also meets the wildly energetic Fujino, who challenges him to a duel over usage of the space. Their duel is actually a very creative, competitive game played out in the public areas of the town. While Rumi almost can't believe what's happening, he has to admit that their 'duel' is the most fun and excitement he's had in a long time, much more exciting than his video games. Before long, Rumi and Fujino are friends, and their adventures with the abandoned tram car, soon named the "Black Parade," have begun!

Heisuke just came into town and the first thing on his to do list is chasing pretty girls, which causes him to get punched in the process. After reaching the house he'll be staying at he sees a girl trying to sneek inside. Seeing this as a perfect opportunity to legitimately grope a girl, he attempts to stop this intruder only to find out that it's the same girl who punched him earlier, not only that but her name is Umi and she just happens to be one of the three sisters who live in that house along with their mother. The next day Umi finds out that Heisuke is a boxer who's skill is only eclipsed by his letcherousness.

From MangaHelpers:

This manga is related to the anime, "Rinne no Lagrange", although it has a different storyline.

On the planet of De Metorio, Izo is a student in the royal pilot training facility, together with his few classmates, Kirius, Arei, and Sanu. One day, they get a new student teacher who happens to be De Metorio royalty, Princess Yurikano. She runs things a lot differently than Izo and the others are used to, but there's more to this princess than meets the eye. Will Yurikano be able to get Izo and the others to accept her training, and will she be able to survive the enemies that are gathering against her? [tethysdust]

Dead man's questions tells the story after Kira Yoshikage's death.

From Lililicious:

In this Christmas-themed chapter of Cattleya Heights, a 4-panel strip by Ooi Mariko, the characters go skiing.

From Bliss: While trying to find a job, Manji, a for-hire bodyguard, also known as "Akainu (Red Dog)", meets Karu who works for "CARDS". Discovering that Karu's mission is to exterminate the deadly "TOYs", which mindlessly attack any living things, Manji can't help but forcefully tag along to relieve his boredom... Edit: Officially a Shoujo manga, though the artwork and action seems to differ.

Back in high-school days, Shin fell for Natsume (a glasses-wearing, short-haired girl) at the first dialogue with her. He even applied for a less competitive major of the same college just to be with her, but unfortunately she was not admitted. Shin helped Natsume to retake the exam and the two became a couple naturally. The story follows small romantic events in their and their close friends' daily lives.

From ShoujoMagic:

Karate girl Seri tries to kick away her past in order to catch a new guy at a singles party, but Tamaki, a childhood flame from her old karate dojo, shows up to show off and makes her heart pound. Their reintroduction leads to a karate challenge, and if Seri loses, she must become Tamaki's "toy"...!? It's a game of love with more rivals and obstacles (and sex!--LOTS of SEX!) than either Seri or Tamaki could have foreseen!

Includes extra stories:

(Vol.02) Virgin Beast - Dumped for being a virgin, Katsuragi Mio decides to ask Virgin Killer, Tsukahara Masaho for help.

(Vol.03) Scarred Innocence - Naive Moeka wants to fall in love but Kamiya Shun might not be the nice guy she thinks he is.

(Vol.04) A Girl's Mischief: Love's Supreme Principle - Renai Shijou Shugi sidestory.

(Vol.05) Rescued Letter, Complicated Love - Nozomi delivers a love letter to Shigeyama Itsuya from her friend but...

(Vol.07) Ribon

(Vol.08) Flower of Despair, Thorns of Pleasure - Renai Shijou Shugi Sidestory. Takarai Kou's point of view.

From: Easy Going Scans

Officer Park Yoon Hee is a beautiful young detective who has high hopes of being accepted in the Violent Crime Division. However, her father and chief of police, has other plans for her… so instead of the Violent Crime Division he assigns her on the Unsolved Crime Division were nothing ever gets done and there is only 2 staff members including her!
The excitement that she most eagerly longs for though, is about to barge in her life when she will meet a mysterious boy…

Two soldiers from warring countries are bound by a pledge as master and servant. Taki Reizen is a commander of sublime beauty, shouldering the fate of his nation. Called "Mad Dog" because of his rough temperament, Klaus von Wolfstadt has sworn his loyalty to him as a knight. Despite this, those around them are cold and disapproving, full of various misgivings. For all their genuine feelings, what will come of love made cruel by the violence of war?

A thousand years before Christ, the last king of an ancient dynasty had to sacrifice his own life and that of his friends and allies to seal away a demon fox causing chaos in his land and driving people to despair. During the Heian period that golden-haired nine-tailed vixen, known as Daji in China and Kayo in India, whose malign influence led to the dramatic downfall of the governments, reappeared in Japan...In Kyoto, a misfortune befalls Mikuzu's family after the head of the household nearly shoots a fox with an arrow. Now Mikuzu, a daughter of a ronin, with a help of her neighbour and a childhood friend Onioumaru, is looking for a way to cure her gravely ill father. Once the demon fox abducts Mikuzu, meaning to recommence her misadventures in a new incarnation, the battle to save the girl and to restore the seal begins.

The month is February, but it hasn’t snowed all winter. Kanon’s father is often away on business trips and might be getting a little too friendly with his pretty young female subordinate; which Kanon doesn’t approve of so soon after her mother’s death. Her little brother collects insects, but they’re dying off.

It turns out that these deaths are the first of many a plague to come down. First it’s the insects, inexplicably dropping dead everywhere. Then it’s the rats, looking for a new food source. And things just keep getting worse…

Lidia is a young empress with a pendant that has a counterpart out there somewhere – which is carried by a young thief tamed Keitsu who runs with wolves. The thief and the empress become friends fairly quickly as they figure out the significance of their respective pendants, but they don’t realize that the entire world is about the be changed by them…

A trans-dimensional fantasy.

A young boy's curiosity leads him to attempt an urban myth which sends him to a dimension called 'The White World'. There he meets a young man who sends him to a world called 'Devildom', he ends up landing in water in a kingdom called 'Kyungma' and nearly drowns until he is saved by a mysterious young girl who seems to control water...

From Fate: Abe no Masahiro, grandson of the famous Abe no Seimei, is always looked down because he could not see spirits. But he saw them when he was younger? After some unexpected occurrences, he can see spirits once more and must try to prove to himself that he isn't just "Seimei's grandson" with the help of Mokkun, the so-called mononoke.

The curse of twelve stars, a girl who plays piano with a dream of becoming a chef, because of an odd job that she pretends to be a boy. What's waiting for Yue Hui is a mysterious mansion and 12 boys who have the curse of 12 stars which fall upon each of them. What's awaiting her? Where are her and the boys' destiny leading to? A love song for 1000 years, the legend of 12 beautiful stars, everything is in《Starry Night Club》

From Summer Rain:
Seo has been in high school for little more than two months. She likes schools that allow casual clothes. However, the annoying, stupid guy, Narusawa Shin is really hard to deal with. Could such men really be?!

Ciel is a member of the 'fairy-wing conservation group' - an organization that protects fairies from hunters who try to hunt them for their wings, which are said to bring the possessor eternal happiness. Ren is a precocious but immature fairy-wing hunter with a tormented past and a grudge to satiate. The encounter between these two will open the doors to a tale interwoven with fate.

From Aerandria Scans:

Etou Ageha is the successor of a family that have been doll makers for generations. Everyone in her family has a special ability - to be able to hear the voices of dolls. With the two guardian dolls, Leo and Yuki, Ageha should be able to become the true leader of the family, but due to some complications, Yuki was lost a long time ago. And thus, our heroine is on a quest to find the lost doll, while accompanied by the other guardian doll, Leo...