Haimura Kiri is a seemingly ordinary boy with one slight problem: he is obsessed with cutting other people's hair. One day he meets Mushiyanokouji Iwai, the "Hair Queen" who cannot cut her hair because of an inherited curse. Kiri finds out that his scissors, "Dansai Bunri no Crime Edge" is the only thing that can cut them. But little did he know that their meeting sparked the start of an old murder game to kill the "Hair Queen" using the cursed killing tools, the "Killing Goods." Can Kiri protect Iwai from the Killing Goods Owners? Let the game begin!

Childhood friends become lovers.

The only way to reverse the curse is to share a kiss with someone who loves him back...! Will Kou be able to reverse the witch's curse, or will he turn into a forest animal? Can the wizard help him?

We all wish we could go back in time, to turn back the clock and fix the past. But in this reality, that simple wish brings about something deadly—demons that devour a person's time! It’s up to a group of strong warriors who fight using time manipulation to destroy these blights. Brought together under unique circumstances, Victor, Kiri, Mina, and Blaze have what it takes to maintain the balance of time as the chosen fighters—the Chronos Rulers.

Note: This is a Taiwanese manhua that Shueisha is publishing for free on its Shounen Jump+ website and app.

Junjou Romantica: Takahashi Misaki is suddenly having some unexpected and odd problems. What started as a need for some college entrance exam tutoring has somehow led him to being romanced by a suave older man who also happens to be his big brother’s best friend. Confused by all of his brand new emotions, Misaki struggles to deal with his suddenly very odd life. And if that wasn’t enough, his suitor, Usami Akihiko, has plenty of issues of his own. A man-child who decorates his room in giant teddy bears and toys, Usami is a famous novelist who also writes steamy boys’ love novels on the side. When Misaki cracks open one of these books and reads sentences like “Usami licks every inch of Misaki’s hot body”…well, let’s just say that all hell breaks loose. Plus it doesn't help with Usami claiming he's in love with him.

Junjou Egoist: Kamijou Hiroki is a broken man, consumed by unrequited love for his childhood friend, Usami Akihiko (the writer from Junjou Romantica). Along comes Kusama Nowaki, whose name "Nowaki" means "typhoon", an orphan working his way through life since middle school. Like the typhoon he is named for, he whirls into Hiroki's life and heart, blowing all resistance away before him.

Junjou Terrorist: As fate would have it, Miyagi Yoh (whom Hiroki is working with as assistant professor) and Takatsuki Shinobu, a high school student, cross paths. Bits of pieces start to link together from the first two stories. That aside, Miyagi, who has a sad hidden past in himself involving a relationship with his teacher, is faced with Shinobu, who just says whatever is on his mind. The wheel of destiny is beginning to turn once again...

Thanks to her parents' incompetence, Taeko is sent to live with an acquaintance of her father. But when she rings the bell of her new home, she's greeted at the door by her new roommate, a completely and utterly shameless nudist named Masuda. Why exactly is he presenting himself in the buff to an innocent high-school girl...? Of course, their shocking first meeting sends Taeko's 17-year-strong values tumbling to the ground! "Is he for real?!" "Am I going nuts?!" It's too late for tears, so Don't Cry, Girl - a hilarious teen comedy ♪!

Source: Jmanga

It also includes a second story called 3322. (Unscanlated)

Nominated for the 4th Manga Taisho in 2011.

Continues where Tantei Gakuen Q ended two years later. They are still in Dan Detective School solving cases.

The start of a lovey dovey life together! Or it should've been, but Matsuri's now living together with her boyfriend's beloved cat Sayuri...!? The struggle for her boyfriend with her cat-in-law begins! Raws: http://sai-zen-sen.jp/comics/twi4/kareneko/

"I want to have a smile on me when I talk to you today."

Menhera-chan is a pessimistic girl.
Byoujaku-chan is a frail girl with a wild imagination and a love for BL.
Kenkou-kun is a normal boy, in body and mind.

This is the story of their dark and heartwarming daily life.

From Yuri Project: Fashionable Yuzu imagined the first day at her new school she transferred to after her mother’s remarriage a bit differently; she didn’t know it’d be an ultra-strict and conservative girls’ school. So instead of a sweet high-school romance, she butts heads with the stern student council president Mei – who turns out to be her new step sister. And she has to learn that hate and love are often not that far apart.

This is a comedy love story about the master and her disciple.

Math teacher mamiya nagisa is teased by his horny students at an all boys high school on a daily basis. One day genius high school student, sakura minato, transfers from America. Minato jumps in to save nagisa who is teased by the students, but is told, "i want to sleep with you." When he asks senior teacher tsukioka for advice, he is attacked by him. What will become of nagisa's purity?

With their parent's approval, Makoto has started living with two good-looking brothers.
The older brother, Souta, just feels like they're burdened with Makoto.
But Makoto can't help but be interested in Souta...
Living together under one roof, a parent-approved love begins.
There is a lot of flirting every day!!

From Viz:
Edgar Ashenbert claims to be descended from the human ruler of the fairy kingdom, and he urgently needs Lydia’s help to find and claim his birthright, the legendary sword of the Blue Knight Earl. Things will never be the same for Lydia as she is pulled into a dangerous quest against dark forces.

Following the untimely passing of his childhood friend and his little sister, Io Haruomi is constantly haunted by their deaths, forever feeling powerless and unable to escape the guilt he feels for letting them die. Despite this, he continues to press forward, attempting to enjoy an ordinary life. He goes to high school, hangs out with his friends, and generally passes himself off as a normal 2nd-year high school student.

One day, however, Haruomi encounters an "Eda", a girl with glowing red eyes and demonic powers. Amidst her escape from the "Seven Great Gospel Organizations", she reveals that he too is an Eda, and the powerlessness he feels is completely unfounded. Before he knows it, Io Haruomi is thrown into the middle of a battle between man and devil.

And as his eyes too begin to glow red, the side he is on is no longer so clear.

Even idols will fall in love! Yu and Hinata are members of the popular idol group ‘ru 2 sh!’. These two people seem to be on good terms on the media, but actually they fight like dogs! One day, Yu, who is going to be taken home drunk by playboy actor Ogura is saved by Hinata!

Beautiful appearance, beautiful food, beautiful legs, beautiful voice, beautiful skills...
Which beautiful boy is your type...?!

The trouble that arises at Private Yubiwa Academy is rumored to be resolved informally, secretively and for free, by the mysterious "Pretty Boy Detectives."
In order to search for "a star she saw 10 years ago", second year Mayumi Doujima opens the door of mystery to the 5 beautiful boys!

From MoonFlower Scans:

This is the story of Sakaki Yuuto, a 17-year-old highschooler who ends up with an unusual job: breaking up relationships by making girls fall in love with him. Unfortunately, in spite of his good looks, he is useless when it comes to women. While his younger brother chases the males and his older brother guides them from behind the scenes, will he be able to successfully play his part and charm the target? And most importantly, will he be able to obey the number one rule of the 'Breakup House', to never fall in love with the target?

This is the bitter story of Meng and his unsuccessful love life. He obviously wants to fall in love but it almost always doesn't go as planned.