Chakuro is the 14-year-old archivist of the Mud Whale, a nigh-utopian island that floats across the surface of an endless sea of sand. Nine in ten of the inhabitants of the Mud Whale have been blessed and cursed with the ability to use saimia, special powers that doom them to an early death.
Chakuro and his friends have stumbled across other islands, but they have never met, seen, or even heard of a human who wasn't from their own. One day, Chakuro visits an island as large as the Mud Whale and meets a girl who will change his destiny.

Note: Nominated for the Tezuka Osamu Cultural Prize in 2017.

Meet Sefiria. She may be just a baby now, but she holds a dangerous secret — she has memories of her previous life as a Japanese salarywoman. Anyway, yadda yadda yadda, she died, got isekai’d, bada bing bada boom.

Now for the meat and potatoes of things. After experiencing the hell of living in such a rigid society like Japan beforehand, Sefiria wants to avoid making that same mistake in her second life. That’s when she remembered a famous saying back in her previous life:

“At ten years old, you can be a prodigy. At fifteen years old, you can be a genius. At twenty years old, you’ll just be a normal person.”

While the new world she was born in considers adulthood to start at the age of 15, Sefiria has a repository of knowledge from her old life to help back her up. Can she become a prodigy at an early age, revolutionize her world, and ensure herself a slow life that any Japanese reader would love to self-insert into?

From Esthétique:

Arianrhod is a young girl from an island called Erin. She is different from all the other kids her age. All the others in the tribe have blond hair while Arian is the only one with black hair and because of this she was bullied many times. One day a traveler in silver clothing came to Erin and “named” Arian. To be named is very important because it reveals one's true self. After that the Master Drisu takes Arian in as his disciple because she was “named” by the stranger. Balor is the evil leader of Death Valley and one night he murdered all the people in Arian's tribe, and she swears to get vengeance on Balor.

The greatest warrior of the Boulder Axe Tribe, Urich.
He accomplished what others in his tribe could not, and went beyond the ‘Sky Mountain Range’.

What he saw beyond the mountains was,

Different clothing being worn, different languages being spoken,
and unfamiliar people in iron-clad armor.

“So, the realm past the mountains wasn’t just a spirit world for the dead!”

An uncharted world, and the one who faces it,

Barbarian Urich is headed towards the civilized world!

Strange things are happening all over town, and Amano Kouichi's having nightmares again. Several clans are spurred into action as the past gradually resurfaces, while Kouchi and his obsessively devoted younger brother Jun keep having inexplicable encounters that those around them seem to know more about than they're letting on.

What, exactly, is being set into motion, and how do the Amano brothers fit into the picture?

“Please, Hilise. Please die in place of Gabrielle.”

My always dignified brother begged me to die in place of our stepsister, whom we don’t even share a drop of blood with.

“For the first and last time, I ask you this.”

I’ve always been miserable, and there is no exception this time. It was the seventh time that I was betrayed and killed, and finally I was completely free of lingering feelings.

“I’m glad that you’re a scumbag until the end.”

I won’t be swayed by love anymore. Now it is my turn to abandon them first.

Tang Sect, the most famous martial arts sect of all. By stealing its most secret teachings to fulfill his dreams, Tang San committed an unforgivable crime. With his ambition attained, he hands his legacy to the sect and throws himself from the fearsome “Hell’s Peak.” But he could have never imagined that this would take him to another world, one without martial arts and grudges. A land where only the mystical souls of battle lay. The continent of Douro. How will Tang San survive in this unknown environment? With a new road to follow, a new legend begins…

You may also like:
+ Douluo Dalu II
+ Douluo Dalu III
+ Wu Dong Qian Kun

[From the author of Return of the Frozen Player:]

“The reason why he does quests like that isn’t because he’s kind but because he’s a sucker.”

Kai looked back at the people talking behind him from a distance.

‘I’m a sucker?! Is it really wrong for me to help those in need?’

[You helped an NPC in trouble.]
[Your kindness stat has increased by 1.]

You’re rewarded when you do good deeds?

A never-before-seen Priest on a whole ‘nother level has appeared!!

Listen up folks! I’m living my life with the demon queen!

I was cursed to become a woman in place of the prince, and then he proposed to me?! My best friend from childhood, the high-spec Prince Vincent, and me, his follower Renoa. Though I've always been a loyal yes-man… Even if you're taking responsibility for me, I can't accept that proposal! The infatuating love story between a troublesome prince and his scapegoat attendant!
Original Web Novel: https://ncode.syosetu.com/n1090ff/

A woman gets hit by a truck and gets sent to the world of an otome game that she had played earlier that same day. However, instead of reincarnating into the main character and focus of the harem, she is fused into the soul of the game's antagonist, the protagonist's rival, and recalled this at the moment she is about to be sentenced to a "bad ending:" isolation in a nunnery.

Awakening her dormant abilities as a devil one day, Yuuko Yoshida aka Shadow Mistress Yuuko, is entrusted with the mission to defeat the Light clan's shrine maiden, a magical girl, by her ancestor Lilith. Yuuko meets magical girl Momo Chiyoda through her classmate Anri Sada, and challenges her to a duel, but loses quickly due to her lack of strength.

Since then, Yuuko has struggled with her role as a devil and her duel with Momo, and borrowed help from her regularly. However, by a strange coincidence, Yuuko also weakens Momo by taking away her power to cooperate in protecting the peace of Tama city.

On her 12th birthday, Angele is infected with the strange and fatal disease that causes feathers to sprout from the body. She is sent to a solitary institution to be quarantined where she meets a man named Hakana and the wheels of fate begin to turn. (Source: Mangaupdates)
Based on the free game from Niconico.
Play the game in Japanese: https://game.nicovideo.jp/atsumaru/games/gm4581
Watch a playthrough with everything narrated: https://www.youtube.com/watch?v=wFmcgB3bikM

The stage; a city where "witches" collect people's worhship. Who appeared there was a man carrying a coffin, and a girl with a beast's eyes. Their prey, "Witches"! And nothing else. When the evil "witch" and the starved "beast" meet, their magnificent and fierce battle begins!

A gamer craving for new gaming experience found a private game server on the Dark Web by accident only to find out the kind of experience he's getting is too much to handle.-------------------------------------------------------------------------------Support the creator and receive faster update on Webtoon:-------------------------------------------------------------------------------http://www.webtoons.com/en/challenge/i-am-the-final-boss/list?title_no=124083

Jeohun is taking the law course at elite school Korean National University. To make matters worse, my father was hit and run…! A strange compass-like object enters his desperate eyes! Suddenly a messenger named ‘Jun’ appeared! It is said that the Time Roulette grands wishes with its powers. Unexpected missions and disasters! And the master of time travel, Karma! Will Junghoon be able to find out the clues of the hit and run criminal and carry out his mission safely?!

A love toy doll that is equipped with autonomous AI and behaves like a human being. They were forbidden to "love".
If you fall in love, the doll will be stupid. Still, they like someone. Is love a human privilege, or is it Science fantasy of dolls in love.

Aruna is the princess of B Kingdom. One day, it is decided that she will marry the king of E Kingdom, a country known for it's bloody conflicts. This is the tale of a girl who carries secrets and ambitions, and a game in which love, pride and life will be played.

After his professor hurts his back, Hakaba is left to continue his research in communications and languages. Boarding a hot air balloon, Hakaba lands in the World of Monsters. There, he meets the half-werewolf, half-human child, Susuki, and the two learn about each other’s culture and language.

“Awaken a New Self”. Lee Oh Reum is a high schooler who plays as a “Healer Shuttle” character in the kinesthetic VR MMORPG game .
One day, his sub character “Avenger” that he was secretly raising becomes the best.
Will Lee Oh Reum be able to overcome all dangers like constantly appearing monsters and various quests to become his new self? An authentic action altermodern drama fantasy.