Fujidou Sayaka is the granddaughter of the famous detective Fujidou Souijirou. After her grandpa passed away, he stated that Sayaka can have his one million yen with the condition that she must work as a detective at her grandpa's agency. Or else, the money will go to the Tsurukamei organization.

Reiki, a 12-year-old boy who has been living with Sayaka's grandfather for 5 years, is now Sayaka's assistant. As pretty as Sayaka is, she's also very arrogant and doesn't like this job at all, and most importantly she often bickers over Reiki. One thing that they both didn't know at first place is that Reiki's innocent face is just grandpa's trick to seal Reiki's true personality - a cold and violent boy. And most importantly, the key to unlocking that secret turns out to be Sayaka's hot naked body!

[From Mangacity]:

From the mind that brought you I'll comes a story set in a unique world of samurai and man-slayers reminiscent of the Japan of old. One man wanders the land with a deep past, a deep secret, and a "merciful" right hand...

Based upon the play of 'The Love Suicides at Sonezaki'.

Hatsu's father sold her to a brothel when she was young. Her childhood friend Toku tries to earn the money to buy her out of there to marry her. However, many obstacles stand in their way.

After dating for half a year, Masaaki decides to take his relationship with his mature senpai to another level. He gathers up his courage and tells her his thoughts right before Christmas Eve. How will senpai react?

From Operation Boredom:

High school Student Kinugawa Kenichi is one of the members of the class committee and also the boyfriend of the super cute Ooumi Chiyako. However, one day, a new student, Kuwabatake Aya, transfers to their school, and demands that Kenichi be her boyfriend...?! Who exactly is this girl, and how does she know Kenichi?

"A.Mou" is young man who likes Wuxia and machinery. One day, when drawing manhua, he makes the mistake of dipping his pen into a bottle of "Thousand-year Ink" given to him by his childhood sweetheart, "Shona".
The two of them are then suddenly sucked into the world of the ink, where all of A.Mou's fantasies come true! Hidden in this fantasy world, however, is a threat that wants to wreck havoc. Out of control fantasies threaten the unsuspecting A.Mou like runaway trains that have lost their brakes...

From Sakura-Crisis:

One day, as Suzuri was walking past a river, she suddenly saw a HUGE peach slowly flowing! Due to the fact she has not eaten since the start of her journey, she decided to just conclude the huge peach was a god sent and did the most logical thing anyone would have done - eat it. However, just as she had her first bite, a young male jumps out of the peach! And before Suzuri knows it, she’s the 18th master to Momo who could do anything that Suzuri commands! What kind of danger would they encounter on their journey as they face a god that goes by the name Kyuui? And what dark secret does Momo have?!

Note: A redrawn remake started in 2015.

From Viz:
In the far future, war has destroyed the entire Earth, leaving only a barren wasteland called Sand Land where the supply of water is controlled by the greedy king. In search of a long-lost lake, Sheriff Rao asked the king of the demons for help... and got the king's son, Beelzebub, and his assistant, Thief. Together the unlikely trio sets off across the desert, facing dragons, bandits, and the deadliest foe of all... the King's Army itself! It's travel adventure and tank action in this new story from the creator of Dragon Ball!

1) No One Can Do It
Hajime is a wandering samurai, who carries a musori sword and is aiming for the top. His goal is to have a fight with the famous Muichi, but upon his arrival in a village his sword gets stolen. And to top it all Muichi turns out to be…

2) Shenzi
The year is 2007 A.D. The advance of civilization has led to remarkable achievements. Those achievements have paved a way for a project which successfully used neural energy to evoke the latent abilities in humans. Those who gained powers beyond the average humans are called Shenzi.

3) Snow-like Cherry Blossoms
One day problem student Karukami gets off on the wrong train station. There he meets Sakura Kisaragi, a cheerful girl that is waiting for her lost dog. A heartwarming story about trust and life.

4) Tower of Babel
In the Tower of Babel people live while they are served by robots. But something goes wrong and the robots turn against humans, it is now up to violent princess Reiche and the swordsman Farose to make things right.

Brave and honorable samurai Shima Sakon(島 左近? ―1600?), a groundfather of Yagyu Yoshikane(Yagyu Renyasai). He was an able subordinate of Ishida Mitsunari, fought against Tokugawa Ieyasu at battle of Sekigahara. Some historical books tell us Sakon had died at that battle. But…others, he had survived and escaped to the retreat in Kyoto where the Yagyu family waited. And…others?

Rayet, codenamed Scuro, works as an assasin for the infamous group Scarlet. His sole job is to assassinate other assassins as part of the "clean up team".

Sick of taking lives, Rayet attempts to leave Scarlet. With the help of a fortune teller named Junki and his assistant Ritsuna, Rayet may succeed. However, Scarlet's rules do not contain a way to let him leave alive.

A summer vacation assignment that involves the capture of human kind? Not only did Rairu and Ome became slaves, even the genuis Betta got dragged into this mess! What will eventually happened to Japan?

Six years ago, following a crushing defeat, a group of friends promised that they will one day take their friend Suzuo to the Koshien. Now in their first year of high school, the friends have reunited behind the pitcher Kitaro Kitaoji to keep their promise. With Suzuo as their manager and Kitaro's signature left-handed, underhand "Submarine Pitch," they may just go all the way.

Won the Kodansha Manga Award for Shounen in 2008.

Yazawa Himawari, a normal student, dives into the world of ROCK...!? A collaboration of Vocaloid Producer and Artist, "HIMAWARI★ROCK YOU!!", a web manga, gain good reviews. -from MIRΔISONIC's youtube channel- 

Sidestory of Seitokai no Ichizon.

Hekiyou Private Academy's student council members are decided through what basically is a popularity contest. Since good looking girls are admired by both sexes, unlike boys, the student council room became known as paradise. As the pillar of the student council, Sugisaki Ken seeks to create his own bishoujo harem due to his love of girls.

A young boy in our ordinary world meets a girl battling a monster and becomes her servant... Why? And what will become of him? The story begins from there...

Once every 100 years, a Water Fairy implants an egg into a person who then becomes the Guardian of Fairies. This time, the responsibility falls on Chagum, the second prince of the New Yogo Kingdom.
Chagum`s life isn`t easy. The king finds Chagum an inconvenience and attempts to have him killed. As a result, the queen asks a female guard, Balsa, to protect Chagum. In addition to this, beings from another world, known as Nayugu, constantly attack him in order to eat the egg carried in Chagumu`s body.

From Storm in Heaven:

The local gods are out of followers, and only have one yokai to give them power! Can Mizuchi, the yokai, bring any more into the fold?

"Let's go together! To Japan!!"
While he was traveling in Central Asia on the Chinese server, Leonardo was dropped into the city of Tekeli that is impossible to escape. Among the worst of circumstances, a savior appeared...
From Log Horizon, the story of another one of its heroes, Kanami, now begins!!