After 16 years of not having a boyfriend, Ikeda Mei is ready for love! When she trips and scrapes her knee one day, a handsome boy sweeps her off her feet and confesses to her. Excited, Mei immediately agrees to date him, but could there be something suspicious about this Sakuraba Yuuto? Could he be.... a huge pervert???

From MangaHelpers:
Nearly half the population of Sakurada, a small town near the Pacific Ocean, has some sort of unique power. These powers range from being able to enter the mind of a cat to resetting the world back to a certain point in time in the past. There is a group known as the "Kanrikyoku" that controls and monitors the use of these powers. Asai Kei and Haruki Misora work for their school's club called "Houshi" club, which execute any missions received from the Kanrikyoku. Misora has the ability to reset the world three days. This means that all events and any memory of the past three days that "could have" happened, never happened. Kei has the ability to "remember" the past. Even after Misora uses her powers to reset the world back three days, Kei will retain those three days in his memory. Combining their powers, these two solve missions issued by the Kanrikyoku.

From ShoujoMagic:

Haru, an energetic, honest, and sweet young girl, meets the popular grade schooler Yashima at a bowling rally, and she unintentionally develops a strange interest in him. He's very forward about wanting to date Haru. However, Haru is in love with her childhood friend, Yuusaku, who thinks of Haru like family and rejected her love confession before he left for America one year ago. But now Yuusaku is back! How will both boys respond to learning that they have competition for the role of most important man in Haru's life?

First volume includes a yomikiri, Let's Go Youth Heaven.

From Aerandria Scans:

Sakura is a princess who lives alone with a few maids in a mansion deep in the mountains. She's been engaged to the prince of the country since she was born. She doesn't like that fact, as she wants to decide her fate on her own. However, one day, a messenger from the prince suddenly came to take her to the capital...

Sakurai-san is reminiscent. I'm entangled with me and I'm watching this when I notice it. And I always turn my happy face at that time. But if you're serious and like me ... A battle of love while being disturbed by girls' gestures!

A series of short, standalone one-shots serialized as intermissions in a certain magazine (usually one per issue).

From Anime-tion Scanlation

A collection of short stories:

1. Tarou-kun wa Yuganderu

2. Kono Te ga Tsuna da Nai aka I Can't Hold This Hand
Touko and Kanade used to be close as children. With Touko outgrowing Kanade in height and starting modeling, a distance is created between those two. They treat each other coldly even though they have feelings for the other. Will they overcome their differences before Kanade moves far away?

3) Umi ni Yakusoku Shizumu

4. Sakurairo no Tsumeato
Mika loves her teacher and one day she gets the chance to confess only to be rejected, but that doesn't stop her from pursuing this forbidden love.
- Evil Flowers

5. Tarou-kun wa Yuganderu Extra Edition

V.2 - Tada, Aishi Sugite Shimatta Dake Nanda

A short 4-koma about a girl with a mean look and her two new classmates.

Moyoco Anno lifts the veil on life in the Edo period pleasure quarter, Yoshiwara. The story follows Kiyoha, sold into a brothel as a child and forced to work as a maid and her rise to prominence as one of the top-ranking courtesans in Yoshiwara. The allure of the "flower and willow world," as it was called by artists in the day, is underscored by the very real tragedy, heartbreak and difficult lives led by those seemingly glamourous courtesans. Will Kiyoha’s fox-like wiles give her a chance to break free of her gilded cage? Or will her fighting spirit ruin her chances of ever escaping the brothel?

New One-Shot from the mangaka of Psyren. 15 year old Eita gets inhabited by a species from space who challenges him to guess its name within five years or else he will be taken captive back to its home planet to be examined and study as a biological species from the planet Earth.

"Progressive Rejuvenation Syndrome." This is an extremely rare disease causing the inflicted person to gradually become younger. The main character of this story, Munenori Agawa, is the only person that could save Rena Amami from this odd disease. Agawa's saliva is the only thing that can halt the disease from making Rena younger, so they must kiss everyday in order for her to survive. This causes an immense amount of conflict and drama between Agawa and his new girlfriend, Sayako Asou. This triangle relationship story tests the capabilities and limitations of human love.

Childhood friends Wakatake and Kagetora meet again after not seeing each other for more than 8 years.

Wakatake is a boy who takes his studies extremely seriously, studying to take over his parents' clinic one day.

Kagetora is an impulsive girl, who spends most of her time fighting outside on the streets, instead of the classroom.

Now that Kagetora has decided to enter one of the most prestigious high schools of the country in order to pursue the love of her life, she needs Wakatake to help her to pass the entrance test...

From MangaHelpers:

After being kicked out of the main dorms for bringing in a stray cat, Kanda Sorata is forced to live in the smaller Sakura Halls where problem students are sent to live. Although he doesn?t mind his roommates, Sorata can?t wait to move out of Sakura Halls. But when Shiina Mashiro moves into the dorm, everything changes. Mashiro is an artistic genius who, at a young age, won many awards for her skills, but due to her childhood being so focused on art, she has no common sense and social skills. Forced to take the role of taking care of Mashiro, Sorata learns about himself and begins on a path of self improvement.

[From Aku-Tenshi]:

In the center on a metropolis city lies a small, shaky-looking house. A normal... Okay... Not so normal high school student, Sakura Tetsu (and his family), who works day and night relentlessly to support his family's living expenses, lives there. All is normal until one day, people from the future, alien pirates from outer space, appear. The underground kingdom claims Tetsu's land. Will he prevail in protecting his own land? Or will he surrender his land into many more invaders to come? Yes... Weirdness and insanity ensues!

In 2071, north pole ice have melted and the land has been submerged. Humanity survived but it's divided into two species: the true humans, those who live in underwater cities, and the Dugons, those who chose to undergo genetic modification to live in the sea. Both species go to war to survive as long as the Dugons consider the humans good to eat.
To defend against the Dugons, the city of Mari Ramelle builds a new kind of weapon, the mermaid robot, Salacia. Because of the small size of the the pilot cabin, the robot is piloted by a girl and a boy, both 13 years old: Marin Yuuki and Ushio Mizushiro. The fight for survival is hard, and during the manga, the city builds more mermaid robots.

Vihta, Avant and Yuta travel the world in their moving trailer "The Sauna". Buying food, buying clothes... It's not an easy life when they share no similarities in age, origin or personality, but they live together like a family and manage to get by. Everything changed when one day, a mysterious little girl wandered into the Sauna. The journey begins to deliver this little girl back to her home town.

Salad Days is a large collection of short love stories. Although almost all of them are unrelated some characters in previous stories reappear as a support character or as a main character if the author chooses to write more stories about the character.

The official spin off of Ao no Exorcist.

Dennosuke Uchimura, is a simple Salaryman, who one day dies run over, and is invoked in another world, by the Demon King himself, who offers him employment as one of his Four Heavenly Kings.
Can Dennosuke survive as a servant of the Demon King, and meet his expectations?

Yajima Kintaro was once the infamous boss of the Hasshu League biker gang, who at their peak boasted more than 10,000 members, but after meeting and falling in love with a partially sighted girl named Akemi, he gradually mellowed and disassociated himself with gang life.

Unfortunately their love proved to be short lived when Akemi died in childbirth, but her last wish was that Kintaro would become a salaryman and raise their son, Ryuta in a stable environment. It's a request Kintaro cannot refuse, and after saving the life of the CEO of Yamamoto Construction he finally gets an opportunity to change his lifestyle once and for all. However, it seems the life of a salaryman is anything but stable when your employers are a multi-million pound constructor whose managing board is made up of corrupt ex-governmental ministers that are busy setting plans in motion to stage a hostile takeover and seize the company for their own nefarious dealings.