Touge Yuugiri is a chick magnet. Without lifting a finger, girls vie for his attention, "accidentally" topple on him, or even invite him to spend some special time alone—it's almost as if he is the protagonist of a harem manga! But Touge could not care less about the attention, as he is gay and feels nothing towards the opposite gender's affection. Yet all his attempts to escape, reject, or scare them away have the complete opposite effect, only intensifying the girls' admiration—as if some cosmic interference was at work. Bombarded by nonsensically perverted situations and unwanted sentiments, Touge's life spirals into a living hell, truly reflecting how one man's dream can be another's nightmare.

Kitou Yukinari is an ordinary high school boy. However, while playing a game of pocket pool one day, he suddenly felt as if he was passing a kidney stone. But this kidney stone was shiny and pink?

A trip to the hospital shows that Yukinari has a medical malady called Adamasu Syndrome - in short, whenever he jets his juice, a little diamond pops out of his saltshaker. Of course, it's painful as hell, to the point where even the act of popping the champagne bottle will shave off his lifespan. And of course, once his secret comes out, dozens of women flock to seduce him, their best friend now stuck inside his best friend. Can Yukinari survive when the world wants to sell his seed?

The school nurse feared by everyone, with her white underwear peeking out of her black tights.
And then she caught me peeping at it..... Thus began the s.e.c.r.e.t afterschool counseling

Tachibana Souta is a bit of a multi-talented freeter who gets by from one part-time job to the next, his standout characteristic being that he's a bit short. One day he's roped by his older sister into 'serving' their college's volleyball team, of which she's a member. She also happens to be at least 6 and 1/2 ft. tall, as do the rest of the team's members who take quite the interest in Souta.

Goryo Daisuke is still unsure about which club to join. When he meets the three girl members of Mysterious Research Club while looking for the school's warehouse, he gets hypnotized to sign the registration form. Suzu who is obsessed with scary curses, Chiaki who only relies on her monstrous strength to perform dangerous magic tricks, and Kotone who can control people by hypnosis.

Our young protagonist faces the greatest challenge of his time... babysitting and rehabilitating three massive perverts. Their rich father has given him the arduous task of turning them into three young, refined ladies.

But don't sweat the details. You're here to self-insert, right? Just pick your waifu: masochist senpai, nympho classmate, or exhibitionist kouhai.

This is the Ayase route of the Oreimo storyline.

Nico specializes in digging, and he used to bother his parents every day by destroying the walls and floors to run outdoors. Nico lives in Teo Village, and one day while hanging with friends, Nico ends up getting into a bit of trouble. This tricky spot is what sets Nico off on his grand adventure.

Amelia, who dreamed of becoming an alchemist and worked hard, became the youngest alchemist in history to be appointed court alchemist.
However, she was harassed daily in her work at court.
In addition, her fiancé broke off the engagement and she has been exiled from court.
Amelia, who has lost everything, finds happiness in a new place with her childhood friend Thomas, with whom she has reunited...?

From Yen Press:

Accepted to a high school specializing in the arts, Yuno moves into a nearby apartment complex to make her commute easier. Just a few days into her new routine, she quickly discovers that creativity doesn’t end with the art school bell! Her neighbors — Sae, Hiro, and Miya — are all fellow students, and each has her own hilarious quirks. And eccentricity clearly rules this school; Yuno’s homeroom teach is a cosplay otaku and the principal is just…weird. Will the quiet Yuno be able to handle this creatively kooky cast of characters?

Konakai Futaba loves her older sister more than anything else in the world. Kind, beautiful and intelligent, Ichina was everything that Futaba wished that she could be... she even encouraged Futaba when she was feeling down. As such, Futaba went to the same highschool as Ichina, hoping to be reunited after two whole years of being apart, but sadly Ichina has completely changed from the sweet, gentle sister that Futaba remembers.

Space is mainly inhabited by three different groups: the Federation, which is the real government; Various pirate clans, which use special techniques and magic to dominate the frontier; and the outlaws which are just about everywhere in between. There are also various alien races and empires which sort of fall within this category. It is on this frontier where Gene Starwind and his 11-year old partner Jim Hawking, freelance bounty hunters and odd-job takers extraordinaire, live and work. Until they happen to take a job from a mysterious woman named Hilda. In no time flat they're up to their ears in pirates...

The story of an Annoying Senpai and his Kouhai.

A story about an ordinary boy named Mekh, whose life is about to change the moment he accidentally hit the infamous and easily-misuderstood girl named Saran.

Jae-Hee is an addict of the trash game Infinite Dia. One day, she finds out that the developers of Infinite Dia are releasing a new gacha game called Terrarium Adventure.

Wanting to get the final secret achievement before the game is discontinued, she puts all her time into Infinite Dia. When she finally succeeds in getting the secret achievement… She wakes up to find herself in a world of fantasy and magic!!

Now, not only does Jae-Hee needs to figure out this entirely new world, she also needs to enlist of help of dryads to stop the world from burning!

"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--?

This is the legendary Go Nagai's breakthrough work. Harenchi Gakuen is an elementary school whose teachers and students are all perverts. Boys peep girls changing. Girls pull up their skirts and show off their panties. Actually, it's not as evil as you imagine. They're like cubs playing together. It's only pre-school eroticism, nothing sexual. In spite of that, Harenchi Gakuen became a sensation. Parents, teachers, and politicians hysterically attacked the comic's immorality.

Hana Tabata is a lonely and unpopular high school girl with negative thoughts. Early morning in the classroom when she was pretending to be a manga heroine, the class's good-looking Yosuke accidentally saw her...!? This love, you will definitely want to support it! Masochistic system unpopular girl comedy!

Charlotte Eleanor is an Archmage that once saved the world. Using her magic to die, she instead, reverses the age of her body to a young child and starts a second life as Aria Lissen. She had a fulfilling life in her first lifetime, except for one tiny regret. In this new life, Aria is determined to find and live for that one thing she never had... LOVE.

However, she comes to find out that her 'demise' was nowhere as inconsequential to the world as it seemed, and certainly not to her mighty Five Disciples, who aren't coping that well.

Famicom Rocky is basically Rocky the movie, but with old NES-era video games. The series stars an ineloquent brute of a protagonist who has long, extensive training montages so that he can dramatically compete against vaguely imposing rivals who, for narrative purposes, are deluded into thinking they're better at video games than him.