From MangaHelpers:
29-year-old programmer Suzuki Ichirou finds himself transported into a fantasy RPG. Within the game, he's a 15-year-old named Satou. At first he thinks he's dreaming, but his experiences seem very real. Due to his use of a 3-time-use special power (meteor shower), he ends up wiping out an army of lizardmen and becoming very high level. He hides his level and plans to live peacefully and meet new people, though developments in the game story (like the return of a demon king) might get in his way.

Jack Aaron is the strongest mercenary known by the nickname “The Bomber.” After completing a heavy mission, what awaited him was a summons to another world!

In this summoning, everyone is granted a special ability. However, the ability Jack was given was quite limited: [Bomb Making]. The people who summoned him from the other world dismissed Jack’s ability as useless, and the other summoned individuals began to mock him as a useless foreigner.

To return to his original world, he forms a partnership with Alice, an alchemist derisively called "The Witch." During this process, Jack learns that the other summoned individuals, who he thought he had killed in an explosion, are still alive.

In order to return to his original world, and to hunt down the surviving summoned individuals, Jack and Alice’s worst journey is about to begin...!

A 34-years-old NEET otaku is chased out from his house by his family. Unattractive and penniless, he finds that he has reached a dead end in life and realizes that his life actually could have been much better if he had made better choices in the past.

Just when he was at the point of regret, he saw a truck moving at a fast speed straight towards three high schoolers in its path. Mustering all the strength he had, he tried to save them and ended up getting run over by the truck, quickly ending his life.

The next time he opened his eyes, he was already reincarnated into a world of sword and magic as Rudeus Greyrat. Born to a new world, a new life, Rudeus decided that, "This time, I'll really live my life to the fullest with no regret!" Thus, starts the journey of a man yearning to restart his life.

Turn the losing heroine into a winning heroine! A romantic comedy about a pure heroine being guided by a mob protagonist!

『The Overwhelming Adoration of the Sweethearted Lady!』

Alicia Ozrind, known in noble circles as the Frost Duchess, is feared for her cold and unyielding demeanor, earning her the reputation of a villainess among the aristocracy. But beneath her icy exterior lies a girl who simply struggles to express her true feelings. There is, however, one person who has melted her frozen heart—a young servant named Gray, who works as a cleaner in her grand estate.

"You’re the only one who truly understands me!"

Completely smitten and vulnerable around Gray, Alicia showers him with unrestrained affection. Whether it’s during meals, in the bath, or even before bedtime, her overwhelming sweetness knows no bounds! But their relationship isn’t without its hurdles—Alicia is a noble lady, and Gray a mere commoner.

Will Gray manage to endure the relentless love of this endearing aristocrat? This is a sugary-sweet, heart-melting romantic comedy set in a fantasy world!

Risa Miyakozawa, aka Zawa-san, is the only female member of the Nissen High School baseball team. She's talented, but being a girl, she doesn't get to participate in any official matches, and yet she trains just as hard as the rest of the team anyway, just for her own personal satisfaction.

Nominated for the 3rd Manga Taisho Award (2010).

Sozai Shuu, a working adult with a slightly weird habit of loving to collect raw materials, was transferred to another world by God after losing his life.

In order to live leisurely, Shuu wished for 『a power to live a carefree life collecting raw materials in another world.』His wish was successfully granted however, his magic power is strangely enormous, and his skill is really convenient? Seems like God misunderstood that he wanted to harvest materials from monsters leisurely so the power he gave Shuu was so incredible….

Nevertheless, Shuu does not take it to mind and freely uses his unique skill 【Detect】 in another world to search for materials, harvest them, eat them, make money off of them and lives a carefree life collecting materials.

My beautiful, big-breasted childhood friend, Mikoto, is completely in love with me.
It sounds like a dream scenario that anyone would envy — but there’s just one big problem...
She’s turned into a clingy, mentally unstable mess with love that's way too heavy!!

This is a dark everyday comedy about being at the mercy of Mikoto’s unstable behavior and unintentional sexiness.

The long-awaited book release of the hit everyday romcom — the story of a mentally unstable beauty that took X (formerly Twitter) by storm — featuring all-new, never-before-published chapters!!

Lina Inverse, a wandering sorceress and bandit-killer, joins forces with roving swordsman Gourry Gabriev in what's supposed to be a quick union of convenience.

Adapted from Slayers main novels 1-8,
4th volume adapted from Slayers Return movie.

The story centers around 16-year-old Hana Ichinose, who unbeknownst to her classmates, was a year late in enrolling into high school. Although it may not seem like a big deal, it is a big deal to her. She wants to catch up with everyone else someday.

This is no different from ordinary villager life...
"There can be no one stronger than me in this world!"
To become the strongest, Yuria, the Sea Queen, went ashore in search of the Demon King. But when she looked at her reflection, she saw the face of a child. In exchange for her legs, she lost all her strength... Even so, still striving to become the strongest, Yuria begins a painful journey!

Amona, a dark summoner and demi-human who uses demonic powers,
is the newest addition to the party of the uptight priest Roni.
Everyone expected the two to dislike each other and to have nothing to do with each other.
But to their surprise, on their first day together as an adventuring party, they had a one-night stand...!

For some reason, he was invited to another world after he rolled the gacha like he usually does.
The gacha from the social game is available in his trusted smartphone.
It was a convenient and cheat tool that can give out equipment and beautiful girl characters.
He now aims to create the world's strongest army of beautiful girls in another world.

Dirty oldman isekai

Fantasy harem-comedy begins with a kind-hearted uncle who helps the weak, crushes the strong while doing some consensual seeding here and there.

Love Momozono is a 14-year-old student at Yotsuba Junior Highschool that tends to care more for others than for herself. One day she visits a show of the famous dance unit "Trinity" and decides to become a dancer, too. On the same event, subordinates of the Labyrinth Kingdom show up who want to collect the unhappiness of the audience. Love gets the power to change into Cure Peach and fights them. Soon after, she is joined by her good friends Miki, who is Cure Berry, and Inori, who becomes Cure Pine.

This is a continuation of the story of Higanjima, featuring an isolated island surrounded by fish demons and a population of warring vampires and humans. Ryousuke, his girlfriend Kazumi, and his friend Yamaoka are shipwrecked by the fish demons and wash up on the shore of this cursed island. They soon encounter the inhuman cruelty of the vampires first hand, before Ryousuke is able to meet up with the human resistance. Ryousuke wants nothing more than to escape the island, but mainland Japan may not be safe for long. If the humans don't defeat the vampires soon, then the vampires will succeed in their plans to spread the virus to the mainland!

Delinquent girls X Pro wrestling X SNS - a unique yankee entertainment that creates a new chemical reaction!!

Reo is tomboy Aiko's rival, and Ai strives to beat him in everything - like basketball and popularity - but her efforts always fail with Reo always coming out on top. Then one day, she sees her break come through: her brother offers her a job at his maid cafe! But how will tomboy Ai ever be able to pass off as a cute maid? With a wig and a bit of makeup, this becomes possible. She's so much of a different person, even Reo doesn't recognize her! But things start becoming strange when Reo shows interest in her, asking out "Mai" on a date. Ai agrees, with plans in mind to get him to fall in love with her so she can later dump him. Will Ai finally win over Reo, or will her plan backfire just like her many others?

The protagonist who was rarely ever at school during his middle school and high school days, is unemployed even as an adult. From morning till night, it was video games. For him who was ranked first worldwide, it was his life.

One day, his character is suddenly hacked. The data was unrecoverable and there was nothing that could be done. Feeling great despair at having lost his rank that he had bet everything to achieve in a world that controlled his life, the protagonist attempts suicide.

When he awakens, he finds himself inside the video game, no, it was a real world that resembled it. There, he notices that he has reincarnated into the the body of a sub character that he had created and bought premium benefits for long ago but had left neglected.

Egil, an S-rank adventurer who has lived hateful of "slave", falls in love with one slave at a slave auction he was forced to bring.
She was Eleanor, the former third princess of the Kingdom of Cornelia.
Eleanor, a slave to Egil, begs Egil to "kill my childhood friend who sold me to a slave trader"! !!
Keep an eye on the estrus slaves if there is a chance! Can Egil rescue the body and mind of beautiful girl slaves and bring peace to this world ...!