It's a short one shot story about an inventor and his niece. "Genius" or idiotic inventor Haido causes trouble with his inventions for his niece, Airi and her parents. Due to one of his inventions, Airi's crush got injured (somewhat), souring their already strained relationship. With her sudden kidnapping, what would the inventor do?

Jr. high student Izumiya is surprised by a sudden kiss from his handsome classmate Hayakawa. Leaving him completely confused, Hayakawa suddenly leaves town, but the two reunite again in high school. As the two continue to part and reunite, Izumiya's feelings start to stir...

From SCX-Scans:

It tells the story of a couple, both very innocent and in love with each other, who are now living together! Takeshi is a pure-hearted college student who is enticed by his girlfriend that has run away to live with him. Temptations ensue.

A manhua based on the Taiwanese drama of the same name:

A really unfashionable working class girl, Chen Xin Yi, desires to tie down her handsome boyfriend to be with her. Due to certain reasons, her boyfriend gets her to go on a love cruise and she started to ponder how to lose her virginity and tie down her boyfriend. Xin Yi ended up taking cold medicine which made her drowsy and caused her to go into Ji Cun Xi's room. Cun Xi is the sole male heir to his family's company and has been in love with his girlfriend, Anna, for a long time. He planned to propose to Anna on the boat, but she didn't turn up. An island owner added drugs into Cun Xi's drink, and Cun Xi became disoriented and returned to his room. Xin Yi and Cun Xi end up having a one night stand. Xin Yi later finds out that she's pregnant, and Cun Xi's grandmother forces them to get married. Will a couple forced to marry for the sake of their unborn child find love with each other?

Features Illya as a main character where she's living an alternate life as a school girl. However, she is chosen by the Magical Stick Ruby and is involved in a quarrel between Rin (Kaleido Ruby) and Luvia (Kaleido Sapphire).

From JShoujo Scans:

With the ability to see the negative emotions of people, and to see it as if they’re monsters, whose character can be different and weird, she is Deng. Because no one can understand how she feels, a wall has been built around her heart. However, after living with her innocent brother and with the help with some good friends and Karas, the person that can consume evil intensions, her world has begun to change…

From Fantasyshrine:

Youhei immediately fell in love with the actor on the late night advertisement, Satomi. After going through some random events, they became lovers. However, how will these two love birds face the upcoming events which involves costumes, a manager, a stalker and maybe an old crush!?

Just before entering the university, Yanagiba Masahiko's father died in a car accident. His mother died when he was four, which makes him now really an orphan. But even before the death of his father, he didn't have a family life, as his father was always busy or abroad.

When his mother's younger brother and his wife decide to invite him to live with their family, his life takes a turn. But it is not going to be the normal family life he is imagining for himself. What is the "terrible" secret that led his parents to break the bonds with his aunt and uncle? What could be the true nature of his cousin, Shion? And last but not least, will this "terrible" secret eventually get Yanagiba, too?

From Dragon Voice Project:
Family Complex... This is exactly what Akira Sakamoto suffers from, being the second eldest son of the Sakamoto family and the only NORMAL person. The rest of the family consists of beauties, from the parents to the eldest son and the 2 daughters. Poor Akira feels that he's totally out of place, and tries to hide this from the others... but then one day it all comes out. How will his family react to this? In this hilarious manga, every chapter is dedicated to one family member, starting with Akira. Family Complex isn't quite like anything else.

The second eldest son, Akira. Appears in another manga Princess Princess as a minor character.

Sweet and pretty high school student Keita is aggressively courting his remedial class teacher, Soga. Soga, however, thinks it's just a childish joke, and that there is no real love... From the beginning of courtship between sensei and student to their first time together, and other romantic stories! In another pairing, an ex-student meets his tutor. Adult love relationships are compiled here. Pure love and romantic love stories of innocent teens and adults who are toyed with by them.

A woman F.P. Ageha helps people in their problems.

From Tokyopop:
Sanami Matoh's FAKE, a BL favorite, is the unlikely love story between two NYC cops--who both happen to be guys...

Meet Ryo and Dee, two New York City cops with an attraction for action, and for each other! When Ryo, a soft spoken officer, joins the NYPD's 27th precinct, he's soon partnered up with Dee's a cocky, confident cop with attitude to spare.

Bunkoban edition includes the extras:
FAKE side story: Act DEE and Act RYO.

From ShoujoMagic:
Yuki and Emiri are staff at Syrup Cleaning Service, but they actually only have one true goal... and that is to find their long-lost boyfriend, Akira. Also includes the 100p story, "We Are Also In Arcadia," where Ryunosuke from "Baby Pop" plays a role.

Anji is the complete opposite of her beautiful, smart and ambitious older sister Anri. To make matters worse, Anji has a hopeless crush on Anri's boyfriend Baek-hui, who is her sister's match in looks, brains, manners and goals. But is Baek-hui all that he seems? From Baka-Updates: Anri and Anji are sisters. Anri is one year older than Anji. Anri is a person with determination and guts, not to mention top grades and attitude. Anji has really nothing to offer. She can be quite mean and unreasonable. But, when it comes down to her sibling, she can be pretty determined. This story details the troubles that Anji goes through because of Anri's two-faced boyfriend, Baek-Hui Kang.

The year is 2718 by the Imperial Calendar, and ZIPANG (Japan) has crumbled in a huge battle against Majinki, terrors from the sky that are half beast and half machine. Hurting each other, warping their morals, unable to see a future, the people strive hard to survive each day. The war wiped out 70% of the human race, but amidst the darkness arose the seven members of the XILE Tribe to bring salvation to the race. But now, 500 years later in 3218, the wicked shadows of the Majinki have once again crept up upon them. This is the story of EXAMURAI, that of the XILE Tribe, who will fight to the death to protect their love, dreams and happiness. Having survived for 500 years since the events of 2718, the final battle of the seven members of the XILE Tribe begins under this azure blue sky... Based on the members of popular Japanese band, EXILE: Hiro, Atsushi, Takahiro, Makidai, Matsu, Usa and Akira.

[From Tsuzuku Jinsei o...]:

As the pioneer Evangel, it is Lufiras' job to rid the world of lower level demons who cause mischief. No hero can go without a sidekick, so Cadiz the (slightly annoying) Intermediate Level Demon decided to descend to earth as well to make sure his little buddy Lufiras-chin wouldn't go lonely. Together with Manaka, who (reluctantly) allowed them to freeload off her during their stay in Japan, they go on their way exterminating low level demons, eating kakigoori (shaved ice thingies) and causing a racket at school.

From Tokyopop:
In the year 184, three leaders (Yoobe, Kwanoo, and Jangbe) rose up against the oppressive Chinese government and were all killed. Now, a 17-year-old shaman by the name of Aram Ko is in search of the reincarnations of the three men. Back in the year 184, Kwanoo had saved a man's life and, in return, that man ensured that every one of Kwanoo's female descendants became a Shaman so that they could serve Kwanoo when he is reincarnated.

Mingchao, Chinese youth and orphan, travels through the "Old West" with the hope of gaining glory and fame. She rapidly joins up with a suspicious priest, Baskerville, and together they head for Hollywood.
Throughout their journey, they are harassed by tricksters and bandits. Mingchao's only memory of her late grandfather, one "Eto gun," appears to be on the minds of the troublemakers and supposedly gives significant power to the one that controls it.

Becoming part of a family...

Bohm (meaning spring in Korean), on his way to give his dad, Detective Ghim, (who's been working for 10 days straight) some underpants at the police station, sees a girl by a vending machine and wishes to see her again...

Mahnsoo, a boy with a strange lonely past, the only witness to an important criminal case, must undergo a disguise as a girl and stay together with Detective Ghim's family until the investigation is over and the case ends. So he meets Bohm again, and trying to get close to his new icy brother is not easy...

Onizaki Teppei is a high-school freshman who just wants to live a plain student life, but his world is rudely shaken by a mysterious girl, Mitogawa Enma, who declares her intent to find a husband at the school!