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...

Based on the widely popular light novel World Of Immortals.I am using the light novel's description below...
The World of Immortals, it is the world every mortals long for. For many, it is an eternal glory to cause a spatial distortion and enter the World of Immortals. But the vicissitude of time is simply merciless, the legends regarding immortality had long been forgotten.

However, a miracle shall rise once more! An immortal was about to split the space with martial arts and cut all ties with the mortal world. The protagonist, Xiao Chen, was caught up in it and accidentally brought to the World of Immortals. What will they find in the vast world beyond the rift?

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.

The story of a woman who asks the lesbian who's in love with her to kill her husband and their life on the run after the crime has been committed.

From birth, Wang Fu is a human raised by the beast race, even though the others in the beast village never truly accepted him, Wang Fu still cares about the safety of his home. When the Black Star Race returns, something has awoken, forcing Wang Fu to step onto the journey to find his true self.

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

Mingling in the human world, wolves that hide in the shadows…This new series by Zariya Ranmaru tells us the story of Lili (Coyote), a mysterious boy and Marlene, a piano player who’s eager to know what’s hidden behind those amber eyes.

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/

As Shin Youngwoo has had an unfortunate life and is now stuck carrying bricks on construction sites. He even had to do labor in the VR game, Satisfy!

However, luck would soon enter his hopeless life. His character, ‘Grid’, would discover the Northern End Cave for a quest, and in that place, he would find ‘Pagma’s Rare Book’ and become a legendary class player…

The story of a young man's journey to realise his life-long dream of becoming an air force pilot.

"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.

A short taken from an Enomoto Shunji tribute collection.

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

Yuki and Hayato are brothers that live alone in a run-down apartment. They were very close in the past, but now Yuki has distanced himself and Hayato doesn't know why. A dramatic story of two brothers with a twist.

Strangers ally with each other to survive a Battle Royale style game of death on a deserted island against other contenders. A lot of contestants have amnesia and each person has a life sustaining bracelet which heals wounds over time.

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?