Summary by amoxi:
A new big beautiful guy is transferred in Hoshino's class. Wait! He's Ichinose, the troublemaker of middle school. At that time Hoshino has written a love novel between Ichinose and his new stepbrother. When the novel was discovered by a classmate, they make fun of them and triggered Ichinose's wrath. Then ichinose transferred. Maybe was Hoshino's fault? And now he's back!

After her Grandmother, her last family member, pass away her beloved teacher proposes to her. But to her surprise her spouse already has a son - the popular, and kinda mean, boy sitting next to her.

Kotaro is always writing letters to Eliza, the girl he likes, but never has the courage to give them to her. One day, a hungry demon called Colchette wanders into Kotaro's garden, attracted by his collection of letters, and encourages him to confess his feelings to Eliza.

From Omari's Sister:

"Pika Ichi" is the story of two painfully shy teens who love yakuza movies. An incident at school pushes them over the edge, and they decide to drop their mousiness in order to dispense some "justice."

Original Webcomic

An 18 year old girl that is in love with her step brother who is same age as her and goes to the same school. She leaps through time and finds herself all grown up... what will happen on this crazy adventure to find true love? Stay tuned to see an amazing story of a high school girl's first love that will be a thriller to read.

From The Zero Alliance:

As a child, Ichinose was given whatever he wanted. Now it's his dream to take over his father's company, but Ichinose's father believes that he is too selfish to manage the company. When Tsubasa takes the last pudding at the cafeteria, and won't let Ichinose have it, no matter how much money he offers her, Ichinose asks Tsubasa to help him become less of a selfish person.

Komugi has lived most of her life at home, until one day when her father suddenly comes home with two tiny men. These two tiny men are the incarnations of legendary enchanted cookbooks. Komugi's Dad charges the two, French Cuisine and Japanese Cuisine, to live with and cook for his daughter. How will Komugi cope with the two tiny rambunctious and handsome guys?

Despite the danger, Kaname runs to his friend Takechiyo’s house when he saw it on fire. Instead of his friend, the one he encountered was a cat demon.
The next day, Kaname sees Takechiyo again, alive and unharmed… but his friend has become a different person. Kaname finds out the truth when he encounters the cat demon again…

Reki Asubino possesses a cursed mark on his hand. Because of it, neighbors and classmates avoid him; his parents have left him as well. Reki may be the only person left inside the Devil's Mansion... but he's not alone. He has a lot of servants in his house… however, they're just not human. He was given as many presents as he would please, but what he really wants is a human companion. One day, he finally gets what he had always wanted inside a box, literally. Though Reki didn't only get a human, but also a caring teacher... and a dear friend... or did he?

A young man called Gil wanders out onto a snowy mountain, hoping that he’ll die there. However, Gil is saved by Torta, a zombie who’s determined to find a way to die. The two of them form an unlikely friendship and learn that living

1) Super Boyfriend

2) So Special

3) Superguy's New Year's Dilemna

Set in Yokohama, this is the story of a vampire with a death wish and a priest with a "survival wish."

After hundreds of years, Mary - an immortal vampire who wants nothing more than to go to his final rest in peace - manages to discover the whereabouts of Maria, a legendary exorcist who has "Maria's Blood," which can be used to kill immortals, running through his veins.

However, this particular Maria is merely a descendent, and is himself clueless about vampire hunting. Despite that, having inherited Maria's Blood means he's constantly being targeted by vampires. Mary thus makes a deal with Maria: in exchange for Maria's discovering a way to kill him, he will protect him from those who're after his life.

Note: This manga is not BL.

Why does he keep glaring at me? Is it out of hate, or...

From Shoujo-Sense: Tsubasa and Shou have been friends ever since they met in kindergarten. Now they're starting high school at the same school, in the same class. Tsubasa has been in love with Shou for years, but never found the courage to talk to him about it. Still, she thinks he may feel the same... until they meet a girl who changes everything. Could she be the one whom Shou truly loves? And what does that mean for Tsubasa?

Demoted from the Prince's Guard and dumped in favor of a foreign princess, Lance is the Prince's dirty secret and the laughingstock of the Seventh Corps. It's no wonder that no one will believe him when he uncovers a plot to assassinate the Prince. With the help of the rest of the Seventh Corps and his new partner, resident smart-aleck Sid, Lance has to figure out how to save the life of the man who gave him everything only to take it all away.

Includes stories not told in the original manga -- some from the past and some from the future.

Tomo fears that "The Underneath the Bed Man" urban legend may be true even though her best friend Sayoko says that it's just a made-up story...

Living with strange creatures has its ups and downs.

Mahiru is a negative girl, who always feels that any stroke of fortune will create a corresponding misfortune. She only wished to live her high school life in peace, but instead she catches the eye of a handsome prince. Laughter, tears, and shortcuts?! An ultra-miracle love story begins!

(Source: Anime News Network)