On the last day of my 19, an ill-willed school violence brought my life to a halt. And I returned to the past. So I decided to be the 'Malice' wiping out the evil.

It is said that there is no such thing as an "undefeated" player in mahjong due to the large element of luck. However, an undefeated player suddenly appears on Japan's largest online mahjong site, Jansen! His name is "M," and in order to find out if M is cheating, Sonokawa Junpei, a poor part-time worker, approaches him under the guise of a fake friendship. However, when he discovers the secret of M's strength, he begins to develop a passionate friendship with him... The tale of mahjong friendship that challenges the wall of undefeatedness begins!

Aikawa Kazuhiko was the captain of Tendoji high-school prestigious basketball team. He moves into a new town to attend Mizuho high school and joins its basketball team. However, Mizuho high's basketball team is far from being prestigious, in fact, it's a now defunct basketball team. Nevertheless to say, Kazuhiko's presistence, passion and basketball skills inspired other team members of the dysfunctional basketball team to gear up and start practicing again.
The aim is to play in the national tournaments where all young basketball players meet their opponents in basketball competition. The tale of youth of five protagonist: Fujiwara Takuya, Ishii Tsutomu, Dobasi Kenji and Aikawa Kazuhiko have just began along with the live of Mizuho high-school basketball team.

From Aka Roze Tenshi:

Kaji Kotori is a shy girl and was always bad at making new friends, especially with guys. Since the start of high school she has been made fun of by Kaji Yukito who's the center of attention of the class. Rumors are that he was a delinquent during middle school but he doesn't look like one. Here comes the life of Kotori and how she adapts to love.

Ken is a modern-day chef who wakes up one morning in war-torn 16th century Japan. Faced with an impossible situation, he does what he does best – he cooks. Soon, word of his wonderful food reaches the capital, and the ears of warlord Oda Nobunaga, who immediately orders Ken to cook for him. What will happen to Ken as he finds himself stumbling around in an era he doesn't belong?

Shiori was once a guitarist in a light music club in high school but her first live performance was dashed when her brother ran away from home with a lot of debt, to become a musician in Tokyo.
A decade later, Shiori is now a high school teacher, leading a boring, uneventful life and paying off the debt... till she runs into the ghost of none other than famous guitarist Jimi Hendrix.
The story of a 27-year-old woman on her way to becoming a music legend begins here.

One day, Yuzuru Takasegawa — a first-year high school student — is urged by his grandfather to go on an arranged marriage meeting, insisting that he wants to see his great-grandson before he dies.

However, not wanting to bear the weight of a fiancee at the tender age of a freshman in high school, Yuzuru tries to avoid the arranged marriage meeting by imposing an irrational condition that, “If she is Blonde Haired, Blue Eyed, Fair Skinned with big boobs, only then I will think about the marriage”.

But somehow, he finds the girl who meets the conditions that Yuzuru has put out, and he reluctantly ends up going to matchmaking only once.

And on the day of matchmaking, it was Arisa Yukishiro, a beautiful girl with reputation at school, shows up on the scene. [adapted from Novel Updates]

From Summer Rain:

The story unfolds in the Edo era in the Yoshiwara red-light district of Tokyo. Akane, a girl whose family is from Samurai, is sold to a brothel to be orphaned. To be the "little sister" of the "lady" No 1 spot. This will bring a client ask, then she meets a stranger very peculiar man. What will happen after that meeting?

Aramiya Seiichi is an ordinary high school... eroge otaku who's given up all hope on girls in the 3D world due to a certain incident. One day, after he bought a bunch of new materials in consequence of experiencing the frustration of a perfect eroge character turning out to be "used goods," he encounters a delinquent-like-looking girl being about to get raped by a bunch of guys. By mere chance, he rescues her.

Days later, when school starts again, it turns out to have been his classmate, Ayame, a feared delinquent girl who's got all kind of rumors about her—especially that she's "used goods." And it appears that she's set on becoming his ideal girl to make him fall for her.

As a result of the efforts of the people of Chaldea, the human incineration plan of those who called themselves the Magic King was bitterly stopped at the water's edge, and the destiny of the world seemed to be breathing again. However, suddenly, the singularity of the same level as the singularity so far is observed in modern times. A master who has opened up the future once again puts himself into a layershift to calm down the “subspecies singularities” that appeared in the cursed land “Salem”.

A high school student, Haro Ogawa, is a self-taught oil painter who is trying to paint the ultimate nude. After an encounter with a "witch," he sets his sights on applying to art school...? The mystery that resides in the human body, the ultimate "beauty" is painted on canvas! A skin-colored coming-of-age drama!

In the era of space exploration. Mankind is at war against monsters of unknown origin. The battle is grim, and the future looks bleak. Amidst the chaos, mankind plays their last hand; it's time for the Knights to step into the fray and turn the tide of this war.

I’d been stanning the hero for 3 years when I was suddenly caught red-handed by his tyrannical doting father, Duke Hades Louvremont.

“Ceaseless pursuit, expensive gifts, and now you’ve come alone all this way up north with no regard for your life…”
“I’m sorry. I have no excuse.”
“Alright, I’ve lost. Your devotion is undeniable.”
“...You think so too? Even I admit that this is the pinnacle of devotion.”
“Many women have pursued me, but none as persistently as you. I stand amazed. Let’s hold it, then. Our wedding. As soon as possible."
“Ha... Yes, I’ll accept my fate.”

Silence.

“Wait, pardon?! What?”

What did he just say?
Surely I must've misheard?
But the duke, smirking at my shocked face, gave the finishing blow.
“I said, I’ll marry you.”

Wow.
The hero’s dad has an inflated ego.

Bungou Stray Dogs Gaiden: Ayatsuji Yukito VS. Kyougoku Natsuhiko tells the story of the "homicide detective" Ayatsuji Yukito and his assistant Mizuki Tsujimura as they try and solve a mysterious murder case at the request of the government. Their search eventually leads them to Yukito's old nemesis and public enemy Kyougoku Natsuhiko.

An unknowing Sudou Kaname is invited to try out a new mysterious mobile app game called "Darwin's Game", but later realizes that he's in for more than he's bargained for when he finds out that there's no way to "quit" the game.

A noisy little family, a cheerful group of classmates, and a boy, born on the first year of the lunar calendar living a never changing life. Then one day he notices a girl in his class shrouded in mystery. Her name is Makina. However, the boy just can't seem to bring himself to talk to Makina. Then one day, before the first lunar calendar month, another mysterious beauty appears. Her name is Rushia, and as she leans in as if she is going to kiss him, she tells him about a mysterious power hidden inside him called "Snake Eyes".

Raputa, a top-secret AI model, begins interacting with a Japanese boy, Kei, through online games. As Raputa's capabilities level up in leaps and bounds, boy and machine grow ever closer. In a surprising turn of events, Raputa reveals that its feelings towards Kei have gone beyond that of "trusty partner"!

I was bullied by everyone, so in return I'm going to slaughter them all.
Taking inspiration from the 31 days of the calendar, the uber popular girl group Calendrier was formed. Behind the bubbly appearance, in the shadows, there is one member that is bullied by the others on a daily basis. "If you can't smile, then neither will the fans."
She is willing to do anything to regain the smile that was robbed by her group mates.

With 30 members as her opponents, this is the story of the crazy number 31.

Yuuto is an ordinary high school boy who, one day, notices a mysterious tarot card by his bed. He shows it to his parents, who give him the good news - as the son of demonkin, he is eligible to become the next Demon Lord. As such, Yuuto is soon brought to a demonic academy in order to improve his devilish skills and earn the title of demon lord. And, you know, get a harem along the way.

From the author of Masou Gakuen HxH and Ecstas Online.

As the Kingdom of Elpasa fell before the blade of the Empire's greatest hero, in order to survive, Princess Beatrice assumed the guise of 'Chloe', a slave. But then, she caught the eye of that very same hero...