I wasn’t reborn with talent or ability, but at least my knowledge from earth allowed me to stay one step ahead in this other world.

Magic exists here, and new progress was rapidly being made in science while magic stagnated in the name of tradition. Using my earthly knowledge and not bound by the traditional thinking, I was able to do things other wizards couldn’t even imagine.

Still, inadvertently becoming an undercover professor for a mysterious secret society at the renowned Sören academy was never in my to-do list!

Spin-off of Kobayashi-san Chi no Maid Dragon. The series focuses on the life of the otaku dragon Fafnir.

I ended up possessing the body of a stepmother in a fairytale, who was so jealous of her stepdaughter that she poisoned her and was executed by her husband. As I was getting along and showering my cute and lovely stepdaughter, Blanche, with love…
“That’s strange. Since when did your wife treat your daughter so preciously?”
…my idiotic husband kept getting in my way!
“I am also Blanche’s parent. You need to apologize for being suspicious of me.”
“And if I don’t?”
“Then I shall come find you in your bedroom, Your Grace.”
“…..”
“I’ve also prepared an especially sexy lingerie as well.”
And that’s how I dealt a fatal blow with a smirk on my face.

The Hero’s party was attacked by a large group of powerful devils. The party will no doubt be annihilated if this were to go on.
One member of the party, the strongest mage, Rakku decided to stop the enemies in their tracks.

The fall of his first year in middle school, Arata Kouda meets a strange bird-like creature named Kujima. Seeing he’s hungry, Arata invites him into his home to eat. There he encounters Arata’s older brother, a shut-in studying for his next entrance exam. After a tense meeting Kujima decides to start freeloading at their house during the winter until the warm spring comes.

In a certain kingdom, there are pair of royal twins who are fated to be unable to live without one another.

Lewd (wild) sisters will listen to all your troubles ♥

In a world where Takafumi, the hero who defeated the Demon Lord, is worshiped as a god, Scott, a young priest, is assigned to the Church of Karma to spread the religion of Takafumi!

However, there is a problem with this church. The problem is that all the nuns here are… super, super, super naughty!!!!! They were all problematic children that they could not be accepted anywhere else!!!!!! One of the sisters would get totally drunk and cause trouble. Another sister held wild orgies with the villagers. And the third sister was so delusional that she would spread lewd rumors all over the place! Can Brother Scott rebuild the church, which is no longer attracting worshipers because of the strange sisters?!!!!! Or will Scott's rational thought be overwhelmed lust for the sisters first?!!!!

An ecchi fantasy, swirling with lust, set in a church! I'd go to a church like this every day!

From MangaHelpers:
Akutsu Takuma wants nothing more than to be left alone, to live and study in peace. He has a terrifying face, which has prevented him from making friends and earned him the nickname "Akuma" (devil). However, he is satisfied with being alone and spending all of his time learning, hoping to become the good person his late mother saw in him.
All of this changes when he gets involved with the nine Saotome girls, who are Valkyries. Takuma is called by Odin to pair with them to protect the world from demons and the threat of total destruction. The Valkyries' power comes from love, and so now he must live with them and try to become closer to them. To start with, they prioritize his intimacy with the strongest Valkyrie, Natsuki. Will he and the Saotome women be able to save the world?

Ataru, a young man who lost his life in an unfortunate case, receives three special powers from God and reincarnates into a different world. The strongest gun, the ability to create bullets freely, and the ability to see everything called "magic eyes". Atal, who is the only gunner in this world, casts himself into a supreme supple adventurer guild with the beastman girl Caro who is rescued from slavery and takes on Atal. The sniper's up-and-coming hero who eliminates any enemy with a single blow, opening from here.

Alice Fortune, the prodigious "Elemental Commander" of the Royal Academy of Magic, is a wizard hunter who aims to bring the magical criminals roaming the world to justice. Then she meets a bored wandering sorcerer, Shin Reisurodo. But what is his true nature?

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.

Tens of thousands of big shots submit at his feet yet he says, “I’m really just a mortal...”
The overpowered protagonist who’s simultaneously the weakest in the world.

Have you ever noticed that someone you knew is no longer themselves? The subtle changes they show that indicate that they are no longer…human? Join hunter Ha-Te and the part-timer hunter Ji-Hyun on their adventure of hunting trolls to save the humanity!

Kim Soohyuk, a veteran rescuer in Shinil-seo was crushed and killed during a rescue operation in a collapsing building. Soohyuk, who thought he was dead, opened his eyes in an incident 10 years ago. [Save Everyone] He was able to save two people that he couldn't save in the past. As a reward, he was also given new abilities and strength. "Great. From now on, I will save the lives of those I couldn't save in the past!"

"Reincarnated as a sub-character of a video game that I used to play!?"

After saving a girl and then getting run over by a car in the process, and "I" was reincarnated as"Rex" in a video game world. A handsome Rex with skills in all fields, but he is a helper character in the early stages. Tho Rex has a high level, balanced skill set and multitude of abilities…He's useless in the later stages of the game!!

I decided in the face the fact that I'm useless in this fantasy world

So let's relax by letting the main character of the game do both "saving the world" and fighting for his life against monsters"!　

This is a story in which an ordinary person looking for a "hero" but instead becomes a hero who saves the world for some reason!

An accidental encounter during his childhood made the newly coronated emperor unable to forget the sorcerer he met, A'Luo. When they meet again, can the youthful emperor capture A'Luo's heart? A beautiful fantasy romance is unrolling.

The story is set in the continent of Jugdral, home of the descendants of the Twelve Crusaders. Lord Sigurd is the hero for the first generation, fighting an invasion from Verdane and helping out in the lands beyond. Sigurd's son, Celice continues his father's legacy in the second generation, where he rallies an army to defeat the Grandbell Empire. From Baka-Updates: Based on the Super Famicom strategy game, Fire Emblem 4 features the son of Lord Byron of Chalphy, Lord Sigurd. Bandits from Verdane made an attack while Grandbell's armies were away, and now Sigurd rallies the remaining forces to drive the bandits out so he can save his friend, Adean... Little does he know what he leads himself into will lead into a tragic turn of events in the face of Grandb.

Baron’s daughter Chelsea was tormented by her mother and twin sister.

Every day, she is forced to clean before dawn and receives corporal punishment such as being whipped and deprived of some meals.

Suddenly, a turning point finally came for Chelsea who was living such a life.

A skill appraiser originally called for her sister unexpectedly determines that Chelsea has awakened a new kind of skill!

Since her sister also need more control training for her skill, they were both sent to live at the Royal Institute in the imperial capital.

Now that she got the chance to leave home, she will never come back!

Also, since she was persecuted before, it’s obvious she needs to repay the favor, right?

“Dirty wench! You stole my necklace!” “Unless I knew where your necklace was, I wouldn’t have been able to take it.” As an illegitimate child, Laritte’s biggest sin was being born. In the year she became an adult, she was sent to marry the ghost duke who was rumored to be dead. Her miserable life seemed to get worse and worse, however… Her life changed when the duke came back alive. “Madam, how do you like it?” Kind servants, “You have enough luxury to buy some residences in the capital.” “…no one will be able to look down on you anymore.” And the empire’s devoted and murderous duke. It was already too late for those who tormented Laritte to regret it. [Taken from NovelUpdates]

They were childhood friends, and she had always been more powerful than him. But when they accidentally traveled (summoned?) to another world, it was finally time for him to become the knight in shining armor! He had to find her first though, since they were separated... Come and witness his fight to be better in a crazy world where monsters roamed and technology was so advanced your amputated limbs be restored to perfection...