Gangnam lost his parents from a fire and has turned blind from the incident. He wasn't able to see anything but a hallucination called Kkamjang. Is Kkamjang actually a hallucination or something more? 'Your scars, your two eyes, and... even your strength! I'll change everything for you.'

The world is being invaded by beings from another dimension called Antinoids, that have many hidden abilities, a Hero of Justice, Rapid Rabbit, has risen up to protect it! Well, that was the case, until he lost the battle to the Antinoid General named "Honey Trap", and, as the general unmasks this gallant hero, she discovers "he" is actually a girl, and immediately falls in love, being unable to kill her! The general then gets fired from his organization, and, once more, finding herself next to the hero, their relationship and fight against whoever comes their way begins!

On a school trip to shinobi-themed Ninjatown, a young man named Ichi Kuno accidentally springs a mystical ninja trap which sends him back to the Age of the Ninja. Having no other path, he must pose as a girl and infiltrate Kurenai Academy, a school of kunoichi students, to retrieve a mystical scroll that can return him to the future. But when everyone around him is already far better at stealth and infiltration than he could ever imagine being, it's not going to be easy. He'll need to employ his own special bag of tricks, and have a lot of luck, if he's going to last more than 5 minutes surrounded by hot kunoichi girls, every one of whom would happily kill him in a moment if he's discovered.

Adaptation [LN]: Sword Art Online Progressive vol.3
Continuation of Sword Art Online: Progressive manga adaptation after Himura Kiseki left the project.

The misadventures of Son Goku, Krillin, and other friends from the original story. Supervised by Akira Toriyama.

Jung-woo is stuck in a reincarnation cycle along with his nemesis, Shin-Ryong. Ever since he was little, he had a dream.
He wanted to become strong enough to conquer Murim.

However, things did not always go the way he planned. Shin-Ryong defeated him on every occasion.
At this point, Ha Jung-woo had been reincarnated 5 times and was defeated yet again.

When he is reincarnated for the sixth time, he is born into the modern world.
Being born into a new world changes Jung-woo's goal, as Murim is gone.
Yet he continues training in order to defeat Shin-Ryong.

Ultimately, he prioritizes the goal of becoming stronger to defeat Shin-Ryong, while trying to adapt to this modern world where he has a family and goes to a school like a normal person.

A fabled genius at killing resides somewhere hidden in Osaka. Taught since childhood to obey the orders of his boss, he is ordered to live in Osaka as a normal person for one year in order for the boss to lay low.

The son, tired of his overprotective mother that has a son complex with a huge imagination for misunderstandings for him and will protect him from all.
Tries to go on an adventure but his mother tags along whether he wants it or not.
NOTE: The mother is the strongest person in the country (OP level)

In a world where humanity escaped underground to survive, En is an impoverished boy who lives off the trash of those more privileged than him. He spends his days in the slums, looking through a trash heap for the decomposing bodies of "losers," those who were defeated and killed in the "Battle of the Six Realms." To participate combatants have to undergo an expensive "body modification surgery," and En sells these modifications, machines attached to their bodies that significantly increase fighting ability. Uninterested in the tournament and its champion, unlike everyone else, he aims only for a worry-free life. But one day, a chance encounter with a mysterious man shatters his reality and puts him on a different, more gruesome path.

[From Viz]:
Being a teenage martial artist isn't easy, especially for Ranma Saotome, who went through a major transformation on a training mission with his father. After an accidental dunk into a legendary cursed spring in China, Ranma now changes into a girl every time he's splashed with cold water. That would be enough to complicate anyone's life, even without the arranged fiancée who doesn't like him (or says she doesn't) and the constant stream of rivals and suitors for both his male and female forms. What's a half-guy, half-girl to do?

Robotic armed freedom fighters fight for Earth's future in this intergalactic tale of the pursuit of freedom. After Earth's overpopulation sends humans offworld to live in space stations, they are abused by the controlling power—the Earth Federation government. Colonists form the Zeon Dukedom to resolve their disputes and wage the One Year War for independence. For over 20 years, the world of Gundam has reigned over all other mecha anime and manga series. Mobile Suit Gundam: Blue Destiny continues the Gundam legacy with the adventures of Federal Forces second lieutenant Yu Kajima and his special unit of mobile suits.

Raising a hundred heroes and ending the war with an evil god, Eisen is the prophet that saved the world. Having received a great injury from protecting the heroes, he left for the Other World to recover. In that time, the heroes made use of their abilities to contribute greatly to the development of the world. Longing to meet again with the master they admired, they reported to him of their achievements in detail. Reading their letters, Eisen makes a decision to set out and pay each of them a visit as he travels the country to sightsee.

The hilarious adventures of the eldest apprentice of a sect who has a problem with his brain.

Dong Fang Xian Yun is reincarnated as the eldest disciple of the Care-free sect. But the only thing that goes through his mind is to make sure he doesn't end up dying by the hands of the "main character". Read as he makes no sense to his sibling disciples while avoiding flags left and right.

Korea's first ever webnovel of the 'another world' genre, Memorize. The legend has returned in webtoon form!] Hall Plain, a different world from Earth. After being discharged from military service, Kim Su Hyun is suddenly abducted to the world of Hall Plain. After many twists and turns, he manages to reach the peak of the Hall Plain. However, all the anguish he had experienced during his 10 years in the Hall Plain left him in despair. To change his bitter past, Kim Su Hyun decides to use the Zero Code's power to turn back time 10 years. "It is absurd to use an object with such incredible power to simply turn back time. I will ask for the final time. Player Kim Su Hyun, do you truly wish to repeat those ten years of torment?" Seraph looked at me like she was pleading. I couldn't help but laugh for no particular reason. For no particular reason indeed.

He can’t even kill a person, but he’s a villain? What kind of Villain is that? Kim Dong Jin, a high school student who calls himself a villain and explores the dark side. And this villain’s fatal weakness is…

A promotional one-shot for "Kamen Rider Decade" published in Tele Manga Heroes.

Zeff Einstein spent his whole life mastering red magic and was finally recognized for it, yet a new spell that was soon created revealed that his talent for red magic was his lowest. Bitter at the thought of all his wasted effort, he creates a spell to send his old self back in time to his younger body and together with the determined "genius" mage Milly and the handsome swordswoman Claude, he intends to master magic more efficiently this time.

I, Takayama Aruto was summoned again in replay mode, keeping all of my past stats. This time, a large Hero’s Summoning was conducted which brought along the whole class. Sick of doing the job of a Hero, I hid my stats from the others and chose to become a merchant. But, I must have hidden my stats so well that our summoner thought I was trash and was casted aside. So, I decided to form a party with the three beauties in my class who were similarly thought to be useless (a Tsundere, a lolita and a meek girl)! But, it’s okay. I still have my Item Box and Item Shop. I’ll just have to make whatever it is I need! And so, I led a relaxed life in another world creating items DIY and hawking, but…… The Dragon Demon Lord and my past wife, a succubus comes knocking on my doorstep and seeking love. It seems that the transmigration this time is going to be troublesome yet again!

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TL;DR Version: OP Harem Isekai Protag gets Isekai'd again (with his entire class this time), hides double OP abilities for slow-life living, starts new harem with girls from the class and the harem from the first otherworld that followed him to this one.

An unimaginable talent without rivalry. Will it prove itself to be a blessing or a curse?

The Remake of Volume two of Bastard!!.