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.

This is the fictional story of an all-female German tank squad, which was "lost in the darkness of history," called Schaferhund. They're fierce fighters who don't fear death, and who think of themselves as expendable. They are typically up against the resistance, who will even use children to murder German soldiers. One day, they get a new commander, a young man who values the human lives of the people under his command. There's plenty of friction between the former acting commander of the squad, Kaya, and the new commander--and not only because he accidentally saw her (and many other female soldiers) mostly naked. What will the future hold in store for Schaferhund?

Rin's village getting attacked by bandits doesn't keep her down in the dumps for long! Picking up a sword housing an extraordinary pervert… I mean hero, Siegfried, she sets off on a journey of many bouts with various degenerat… ahem, heroes!

Be spoiled rotten as a little brother by 「Heart-throb」-deficient older sisters!?

Touri, a college student searching for his older sister whom he was separated from 10 years ago, discovers that his admired senior, Sara, is a former magical girl, and that his sister was once a magical girl as well.
He continues his search for his sister with Sara’s help, but it seems the magical girls who have become “older sisters” can only draw magical power from heart-throbbing romantic excitement...?
The harem romance comedy featuring a former magical girl “older sister” and her “little brother” begins!!

Before I knew it, I was in a world of 18+ games with magic and erotica. In it, I was reborn as Ultos, the worst scum in history. If I continue like this, I will meet the worst possible fate. Somehow, I must be reborn from the hated character known as 'ScumUltos' into a pure and innocent mob character...!!

Hidden is a scout who joined the hero's party to defeat the Demon King. But the hero, Ashram, and his party members did not know anything about the fundraising, the spies sent by the Demon King, or the assassins sent by the rebels.

Deciding to support from behind the scenes, he took on all of the dirty work for them. But his party members did not know about what he had done for them, and ended up casting him out of the party...
With nowhere else to go, Hidden headed toward the dark guild.

"I can't do this!"

Yoke Feldio, A Red Mage, has left his A-rank party of five years to become an adventurer, and has finally run out of patience with his life as an adventurer. being ridiculed as a "Handyman" and "poor dexterity"!

And so begins a desperate life of joblessness....

HOWEVER! Soon after Yoke is welcomed into a party of former students, all of whom are girls! And as he conquers dungeons, Yoke's abilities are revealed one after another.

In fact, the magic and skills that he wields have a power that is beyond the norm--?

Raul who had defeated the demon king as the strongest hero should have become the savior of the world.

Having his treasured companions and family killed by power hungry aristocrats, he was executed with false charges brought against him by the princess. Just before his life collapsed, at last his heart fell into darkness.

...I will tear those traitors from limb to limb. Burn them at the stake. Sever them to pieces. Skewer them. I will kill every one of those bastards without mercy and make them taste hell's suffering.....!!!

Obtaining the power of darkness, Raul was revived. Sneering, he vowed revenge.

“Oh, I’m looking forward to it – from now I'll bask in their blood as I please.”

Several days after the hero's revival in the imperial capital where flowers bloomed in profusion, the parade that would advance towards tragedy began.

"Become a hero!"

With that dream in her heart, Shirumiruku Eru became an adventurer. But because she had no special skills, she struggled to find companions. That's when she got the chance to join the dungeon investigation led by Yuris, a great sage who specializes in healing. However, rumor has it that all adventurers who accompanied Yuris have had their spirits broken and abandoned their path as adventurers halfway through... You see, Yuris had a bizarre interest in getting excited by the sight of female adventurers being attacked by monsters.

Masamichi Akita, a high school student whose motto is to live wisely, who meets Setsuna Rikudou, a high school girl with a violent supremacist attitude.

Akita is saved by Rikudou when he is tangled up with a delinquent, and is attracted by her overwhelming strength, asks her to teach him how to fight. However, Akita is devastated by Rikudou, who asserts that “violence is the only rule in this world”.

Akita's encounter with Rikudou leads him into the world of “violence”.

By the time he opens his eyes, Kubota Tamotsu (34 years old) has been reincarnated into another world. Moreover, as a 6 years old slave with “Level 1 Barrier” skill. To surpass his limitations and become a powerful Barrier master Kubota begins a hellish training, full of obstacles and struggles. — From “Let’s Become a Novelist”, a new other world fantasy starts!

People called “challengers” are gambling their life trying to escape from The 100 Story Tower to win 10 billion yen. But what will happen when Tatsuki Kuroumi awakes at this tower without remembering anything about his prior life, including entering the tower as challenger?

One day, Sanada Shirou, who works for a black company, is transported to another world. Using his "creation magic", an ability he gained when transported, he opens an inn and is supposed to lead a slow life, but this other world is a little strange?! It is a world where women are overwhelmingly dominant, where women do dangerous work and battle, and men are powerless and are protected! The daily life of entertaining (in many ways) the women of this other world begins...!

Web novel: https://kakuyomu.jp/works/1177354055503576578

Towa was reincarnated in the same other world for the second time. There, although time had passed since his first reincarnation, his friends at the time were spending their days feeling too heavy for Towa...

“Isn't it okay to stay by your side forever?” "If you disappear again, I'll die and chase you this time!?"

The beautiful elf they meet again and the sexy succubus heroine press for physical contact as if to make up for the time they lost, and Towa, now a young boy, is violently approached...?

“Towa, could you please take me too?”

A harem fantasy begins with the heroines who have feelings for each other after reincarnating for the second time!

Kanae is a girl who is struggling to fit in with the popular clique at her high school. Because she had been bullied in middle school, she has developed an acute inferiority complex that had led her to engage in compensated dating in order to feel wanted.

In comes Hiroshi, a high-school baseball star who became drawn to her after finding her crying during a group date at a karaoke bar. Thus begins an unhealthy relationship between a mentally unstable high-school girl and a jock.

Average high school student Mikagami​ Kouji is a hardcore gamer. One day he gets isekai'd and he only gets the skill "copy" which is apparently useless but we all know it's secretly OP or something. He's enslaved to be a gladiator by his summoner, the big booba, head priestess Zayd. He has to fight in the Colosseum and if he loses he gets raped.

Na Hae-soo's life unravels when her husband betrays her with an affair, leaving her burdened with debt and losing their child. In a devastating blow, she witnesses him with a younger woman. Broken and despondent, Na Hae-soo feels her life crumbling around her. However, a mysterious young man unexpectedly enters her life, asking to be taught about adult love. His vulnerability and sincerity begin to stir emotions within Na Hae-soo, challenging her to reconsider her path forward.

When the Devil King announces his retirement, he calls forth his two sons, Yomi and Sora, to give them each a quest. Whichever of them finds a pure Yamato maiden within a year would inherit the throne of the Devil King, while the other would die. Thus begins Sora's sex-fuelled adventure to find a woman that can satisfy his father...
(Sakigake!! Otokojuku Wiki)

In an era where one in every twenty people awakens to a "special ability," Hiroto Takigami is a weak ability user who can only communicate with spirits. However, for some reason, his stepsister Rei, the most powerful ability user, harbors deep hatred toward him. The moment he graduates from an ability training institution and gains full control over his power, Rei kills him. With only one year left to live—his "remaining lifespan" set—Hiroto falls into despair. Just then, a certain spirit appears before him, revealing an unexpected secret about his ability...

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers - one of them being the girl he tried in vain to save - be reincarnated into another world.

Yet a series of unfortunate events forced Hiroto to reincarnate with even less luck than before, starting with nothing but a tremendous amount of Mana. His second life, far worse than his first, came to a cruel end.

However, upon meeting the god a second time, he was informed that there would be yet another reincarnation - one that had already been set in motion and could not be stopped. Not wanting Hiroto to endure a third life filled with suffering, the god cursed him before he was reborn in the hopes that he would either die quickly or commit suicide.

Hiroto was reborn once more as a half-vampire, half-dark elf. A dhampir. Not wanting a fourth life, he is determined to live this third life with the only things remaining from his previous lives - Death Magic and his enormous Mana pool.