"I love you! Let's get married!"
That is how Itou's first encounter with Naitou went on their first day of school. Since then, Naitou has been relentless; proposing to Itou at every opportunity and singing his love for her. But Itou is no obedient goodie-goodie to just sit back and let Naitou do as he pleases. Firing back with her own diatribes, she is determined to fight this out till the end.
A comedic tale of two twisted idiots and a boy's neverending pursuit to get his girl... even if that girl absolutely hates him.

It’s been 20 years since dungeons suddenly appeared in the world. Humanity got supernatural powers like Level, Status, and Skill.

Dreaming of becoming rich quickly, Amane Rin, an adventurer challenged to capture dungeons. Even though he possessed a skill unique to even adventurers
Transfer within dungeon
, he was deemed as incompetent because of the poor usability of the skill. However, the turning point for him came.

After a year since he started capturing dungeons,
Transfer within dungeon
evolved with a level up. As a result, Rin became an existence unrestricted by the rules of the dungeon. Rin, who became the only singularity, continued to level up with overwhelming speed and climbed to the strongest position in the world in the blink of an eye.

This is the story of a boy who was looked down upon because of his incompetence but eventually became the strongest in the world.

It was in the year 2800 of the Midgard calendar. Back then, there was a Overlord who once reigned supreme and had reached the very brink of subduing the world. Her name was Lufasu Mafaalu, a great woman dreaded as the Black-Winged Overlord. She was too strong, too fast, and too beautiful. However, she was defeated by Heroes who opposed her ferocity, and her ambition was brought to an end.

Or so went the story of our protagonist’s in-game character, whose body he now possesses for some reason in a world 200 years after Lufasu’s downfall. Follow our protagonist as he becomes unnecessarily feared by his surroundings and unnecessarily worshiped by his former subordinates as he―or now she―cheerfully travels around this fantasy world.

With the laboratory, where individual researches come together, as a stage, an experimental sciences love comedy with laughs and kyun kyun, drawn by Yamamoto Alfred. 

As a result of a large war, the world was eroded by a magical infection that distorted the time and space around it. Though magic has been outlawed since then, the effects of that war still remain. To uncover all the secrets of the world, "Lucky Solte," begins her adventure.

Continuation of Kamen Rider Spirits after the series changed magazines, Shin Kamen Rider Spirits follows the war between the evil Badan Empire and the 10 Showa Kamen Riders and their allies.

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.

From MangaHelpers:

Utilizing a system called "Sense," each player aims to create their unique character in the VRMMORPG "Only Sense Online." Joining this realm is Yun, an absolute beginner in the world of gaming, equipped with some of the worst customized "Sense" ever. While his two sisters, both veterans in this world, criticize his choices of equipment, he continues to delve into the skill sets he has acquired. Along his way, he meets the art of "production" and people that have mastered this art. Watch as a total novice creates a revolution in the gaming world and create the "ultimate" support class. [DrCoke]

One day, when I was making school supplies in the art room, a very scary-looking girl was staring at me...!? Crafts girl vs. art boy romantic comedy!!

“You just die one day and turn into a mummy!” Mysterious mummified corpses that people have nicknamed “Mummily-sans” keep being found one after another, causing a lot of fuss. One day, a boy named Seita notices that his friend is acting strangely…?! Don’t miss this thrilling suspense story about an invasion by the unknown!

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.

The end of the world is coming, and human beings have awakened their superpowers and fought against the monsters in the towers. However, there is a strongest BOSS sitting at the highest point of the tower – Demon King Jiu Ming. He is an insurmountable barrier for humans. One after another, the brave men always thought that they were the protagonists in the story, but the halo of the protagonists never came to them. When the protagonists lose their protagonist aura, they no longer are the protagonists.

Park Han-jun, once called a legend, was frustrated because he had nothing to lose anymore is given a huge amount of money.

An eye for an eye. An eye for a tooth! I’ll make you pay for what I’ve gone through!

As his rage explodes, he’ll get his sweet revenge and make them pay as much as they deserve!

Due to an accident, the protagonist Varius died and was reincarnated. He was shocked to find in this new world, his former job as a Tamer in the previous world was acknowledged as a low class job in this new world.

Utilizing his knowledge from his previous life as a basis, he then applied unique buffs to his beasts, taking back the ultimate power that he once possessed.

With this power in his hands, he sought to start his life as an adventurer. However-

Artist's Twitter (NSFW): https://twitter.com/NiwaRhythm
Webnovel: https://ncode.syosetu.com/n7251fq/

The strongest swordsman of the Warring States period, transferred to another world.

At the end of the Warring States Period, Ginko, the greatest swordsman of the time, was always hungry for a fight to the death with someone stronger than herself. After cutting and cutting and cutting, she finally despairs that there is no one stronger than her in this world, and then she is transferred to another world! Before her eyes - a dragon!

Izu Takashi was just playing the online game -Argate Online- like usual, but he suddenly noticed something strange, his level is now....!! Also he can not log out and the pain reduced funtion does not work.....

From MangaHelpers:
A young noblewoman once dreamed of becoming a magic user like in the old tales, but her time in magic school has dimmed her passion. One day, a mysterious man comes to her rescue in the forest, using magic like in the old stories. Despite the fact that he is clearly skilled in magic, he is thrilled by the idea of learning new techniques. Since the only way to do that in this day and age is in magic school, he alters his appearance to school-age and decides to accompany her back to school.

Looks like I’ve been reincarnated into a gamelike world filled with monsters and dungeons. But don’t worry—it’s nothing I can’t handle. I chose Creation Magic for my unique skill, you see, and it lets me make whatever item I want...so long as I’ve got enough mana. Ah, there’s always a catch, isn’t there? But where there’s a rule, there’s a loophole—and this little witch knows just the trick to expand her mana pool a bit more each day.As for what I’ll be up to in the meantime, first I’ll make a friend. (Literally. Golems are a thing in this world.) Next, I’ll make some tracks. (And the sooner, the better. The goddess dropped me off in the middle of the wastelands). Then finally, one day, I’ll make myself a place where I can truly belong. (That’s the plan, at least.) Time to make some magic!

Presented with the strange Gift of Village Building, Luke, the son of a lord, is cast out of the domain in shame. He arrives in a barren land with plans to develop it as well as he can, and to live a simple, quiet life...when suddenly his mysterious Gift activates! Enjoy Luke’s amazing, slow life, and watch as his village grows, his Gift levels up, and his village-building capabilities transform in this new comedic series!

Tsuji, a high school student whose sister was killed by a spirit several years before the beginning of the story, joins his school's Paranormal Research Club after hearing rumours of its president being a brilliant exorcist, hoping to gain the skills necessary to avenge his deceased sister.