I killed the player.

He was a real son of a bitch…

He loved me too much and was a sociopath.

Now that I'm back in time, I'll kill him before being manipulated again and save the harem's girls who will help me win the video game's scenario!

Nezumi is a girl who was raised as a hitman by the yakuza and grew up not knowing human love. An ordinary young man, Ao, knows nothing. They fall in love and start to live together, but the evil hand is close at hand.... This is a story of first love, so cruel and so sad.

Olivia is picked up by a death god, Z, deep in the forest as a child and trained by him in combat for reasons unknown. One day, Z disappears, leaving behind a letter instructing Olivia to head to the Kingdom along with a sword bearing the qualities of a death god's weapon. Thus, the girl lacking in common sense, knowledge, and normalcy sets off to join the army.

This battle fantasy manga follows several heroines who protect people from the monsters that appear through a gate connecting to an alternate world known as the Mato (magic capital).

By the time he opens his eyes, Kubota Tamotsu (34 years old) has been reincarnated into another world. Moreover, as a 6 years old slave with “Level 1 Barrier” skill. To surpass his limitations and become a powerful Barrier master Kubota begins a hellish training, full of obstacles and struggles. — From “Let’s Become a Novelist”, a new other world fantasy starts!

People called “challengers” are gambling their life trying to escape from The 100 Story Tower to win 10 billion yen. But what will happen when Tatsuki Kuroumi awakes at this tower without remembering anything about his prior life, including entering the tower as challenger?

"I shall devour this Jianghu!"

Says a mysterious son of the fruit merchant, holding the Monarch Sword in his left hand, and the Hell Blade on his right.

Possessing not only eloquence but even an overwhelming martial prowess, what could be his ultimate goal?

The delightful journey of the twenty year old youth, ' Jeok Leegeon', who dreams of dominating the martial world, begins!

A cat familiar goes looking for a kawaii mahou shoujo to save the world, but the chosen one is a rather special girl.

A mysterious syndrome turns schoolgirls into homicidal monsters behind numerous atrocities in Japan. However, nothing is what it seems and when Chika Amagi is arrested for the brutal murder of five people, which starts a journey into uncharted and troubled waters!

You know what’s worse than breaking up with your girlfriend? Getting stuck on a sadistic alien gameshow with her cat. Join Carl and Princess Donut as they try to survive the end of the world — or just get to the next level of a trap-filled fantasy dungeon.

The protagonist along with his step-mother, and 2 step-sisters are summoned into another world where demi-humans are the rulers as saviors, but its not to fight against a demon lord, its to fight an Undead Apocalypse monsters called "Dead Mell" that have overrun the world and that can only be killed by using weapons made with holy silver.

For that, a familia is made (group of 4 people) with them being the swordmaster that uses the holy sword, the guardian that uses the power of earth to protect, the healer that use the power of water to heal and the black mage that uses the power of fire to destroy.
The role of the guardian, the mage and the healer is to support the swordmaster that can only kill the monsters.

But to use magic powers one must offer part of your being as a sacrifice to form a contract with spirits, and the higher the sacrifice, the higher the power. Now they must choose who are the 3 that need to sacrifice part of their bodies to gain power and who will wield the holy sword.

Action thriller about an obsessed lonely man with a delusional plot to save Japan by assassinating a politician. But his twisted plan is disturbed when he witnesses a young girl next door getting abducted by the Yakuza. He decides to save her but his attempt ends in a chaotic massacre where he manages to kill the gangsters. But things only get worse from here on out, now he's getting hunted down by even more ruthless killers.

From Exertus Scans:
Millions of years have passed since the times of legends, when the worlds of man and gods were still the same. In these times it was the desires of man that moved the world. It is the era of the 500 year war: The warring states period. Kingdom is the story of a young boy named Shin who grew into a great general and all the trials and bloodshed that lead him there.

Note: Kingdom won the grand prize for the Tezuka Osamu Cultural Prize in 2013.
The manga also earned a Guinness World Record on December 12, 2012 for Manga written by the most people. The record was due to its "Social Kingdom" campaign in which fans and other artists were given the task of redrawing the entire 26th volume.

The Netherworld: A world inhabited only by Demons, creatures born from the dark abyss. For Salvos, a curious newborn Demon with a penchant for making friends, surviving this hellish landscape was always going to be a difficult task.

And when her companion's life is threatened by a mysterious Demon King, she'll have to adapt, gain experience, and evolve to do what it takes to save him. Even if it means separating from him and being tossed into an unfamiliar world with Humans, monsters, and a bright blue sky where she is scorned for being born a Demon.

After all, the law of evolution is survival of the fittest, and Salvos will survive.

Kagura is a samurai girl known as the “Sword Saint” for her mastery of the way of the blade. And Raito is a boy who belongs to the race called “Nin'you” that is hated by the humans. The two met in their childhood and spent happy times together as best friends, until the difference in their races separated them. Kagura took up the sword for Raito. For the sake of them living together. The bond between the two transcends years, walls, races, reality! Surpass it all!!

The oneshot story in Sunday magazine received such a great response that it has been decided to serialize it! With overwhelming brushwork, it dashes into the world! The curtain opens on a Japanese-Western mixed fantasy!!

Fogland, a mysterious international prison, traps Dante Kang a science teacher sent to reform prisoners during a sudden riot, leaving him with only one way to escape: by becoming a leader.

As the strongest exorcist, a boy chosen by God was engaged in mortal combat with the Demon Kings. Although he bears the fate of humanity on his shoulders, he actually wants to make sweets peacefully. One day, he meets a girl... This is a story of love and hope growing in the midst of a holy war.

In order to eat me, my enigmatic stalker is protecting me from other strange women―

A high school boy, Sakurai, has a secret he cannot tell anyone: he has been plagued by stalkers since he was a child.
One day, his classmate, Ueda, suddenly transforms into a monster, revealed to be one of his stalkers.
Miyako, who has always been closely following him, appears and saves him.
She tells Sakurai that the monsters, commonly known as urban legends in Japan, are after him because they love him.
What will be the fate of Sakurai who is loved by countless creatures disguised as beautiful girls?

Links:
Author's Pixiv: https://www.pixiv.net/en/users/25451722
Author's Twitter: https://twitter.com/tadaresan

On his way home from his office, the main protagonist drove and ran over a big dog. At that moment, he heard the sudden sound of a voice inside his head. ≪ The monster has been subjugated, gaining experience points. ≫ 「Eh?」 Before anyone knew, the world has changed. Monsters appear, this is a game-like world where levels, skills, and status exist. This is an adventure where the modern world becomes fantasy and where the main protagonist has to strive hard for his survival.