“Scramble Love” is a smash-hit Japanese romantic comedy manga with over 10 million copies sold.
I was thrown into the world of that manga—one I had never even read.
And not as a main character, but as a forgettable extra with barely any role.

"A World Where Chastity is Reversed"—A dream world where the male-to-female ratio is 1:20, women have stronger sexual desires, and precious men live a smooth life protected by their bodyguards.

Fifteen years have passed since Ikuto Ichise was reincarnated into this world, which should have been a guaranteed harem, but for some reason, he isn't popular. Ikuto laments that it must be because his bodyguards are all handsome men, and especially his childhood friend Rui Toosaka, who is particularly high-spec... but in reality, the bodyguards are beautiful girls disguised as men! Completely unaware, Ikuto is overly close and unguarded, making every girl feel like they have a chance. As he unintentionally forms an oblivious harem, Rui, who wishes to be seen as a girl, reveals everything to him—!?

Being reincarnated in a cultivation world, Han Jue realizes that he can live his life like a video game. He can reroll his cultivation potential and connate providence.
So, he spends 11 years rerolling for a good one…
[Unparalleled: Immortal beauty, top-notch charm]
[Destined Sword fanatic: Top-notch Sword Dao aptitude, top-notch Sword Dao comprehension]
[Unparalleled Movement Technique: Top-notch movement technique aptitude]
[Descendant of the Immortal Emperor: You will receive an unparalleled cultivation technique and 1,000 superior-grade spirit stones]
In pursuit of longevity, Han Jue decides to cultivate in a low-profile manner.
A thousand years later, generations of cultivators have become history.
That is when beings of the fairyland start cleansing the mortal world. Han Jue can no longer hide and has no choice but to take action.
Then he realizes, that deities and gods aren’t that powerful after all!

The Magician named Yard was suddenly summoned in different world as a Hero. The sorcery in this world is behind compared to Yard who came from another world. The other summoned heroes are also unreliable. Furthermore, it is not possible to return to the former world... In such a hopeless situation, Yard chuckles to himself. Get ready, humans of this world. This world where witchcraft is behind. I have enormous toy in this box. allow me to play with it. The Villainous magician named Yard tramples down the other world with overwhelming Dark magic!

Struggling streamer Doyeon Choi downloads a mysterious dating sim game, Heart-Racing Ghost Dating Sim, only to find himself trapped in a deadly loop-- where the love interests are real-life ghosts with unresolved deaths. From haunted highways to murder cases, Doyeon must navigate a world where romance, horror, and mystery collide. Every wrong move could cost him his life...again.

Negizawa Kamo once tearfully promised his weak childhood friend Kagyu Jubei that he would grow up to be a teacher who would not stand for bullying. Several years later, as a teacher, he meets Kagyu once more under strange circumstances to say the least.

While Negizawa was training to become a great teacher, Kagyu (who, like most women, fell for Negizawa) polished her fists so that she could protect him when they met again.

Hilarity ensues as Negizawa strives to become the teacher he once dreamed of being and Kagyu protects his chastity from the numerous women who lust after his sweet behind.

Accidentally summoned by an ancient map, first year high school student, Kiyokawa Hiroto is forced by the arrogant Lord of the castle to exterminate the vampire that has been haunting his castle. Unexpectedly befriending a girl from Mummy tribe, Hiroto skillfully managed to capture the Vampire with her help. However, he is soon framed by the Lord of the castle. Bravely and kindly aiming to be a Lord, the fantasy of summoned to another world starts!

Aijou experienced 100 heartbreaks during Junior High. While praying in a shrine, the God of Love appears, saying that Aijou will meet 100 fated girls. If their relationship with him fails, all the girls will face an accident and die. Now it's a matter of love or death, and it's up to Aijou to decide.

I "transmigrated" into a world I'd never seen before.

For thirty years, I believed I was living in a classic fantasy RPG.

I became a war hero, retired, and thought I was finally about to see the ending.

But...

Those thirty years were only the prologue.

It turns out the real story is about an academy?

The strongest doesn’t need any cheats!

Haruka, who spends his high school life a loner, was suddenly summoned to another world one day along with all his classmates.

When ol’ God enters the picture, Haruka believes he can just choose whatever cheat skill he wants to help him survive in the new world...
But, contrary to his expectations, that list of cheat skills works on a first come, first serve basis. And so, his classmates pick out all the cheat skills.

His choices now limited to leftovers, Haruka finds himself incapable of assembling a party due to his own “loner” skill.
Even though it’s a different world, it seems his adventuring days will be, as per usual, a solitary affair…

After becoming aware of a crisis looming over his classmates, Haruka makes a silent vow to save them. No relying on cheats!
He will walk a heretical path of strength that transcends the need for them.

The curtain rises on the strongest loner’s otherworld strategy guide!

Noble young ladies were often said to be either rude and ill-mannered, or hopeless airheads with nothing but flowers in their heads.

Even in an age filled with such rumors, there was someone who taught them.

A commoner named Derrick, who awakened to his talent for magic and rose to prominence as a mercenary, is one day invited to serve as a magic tutor for noble young ladies.

As Derrick proves himself a star instructor— turning spoiled aristocrats into proper “people”— prestigious noble families begin lining up with offers of their own.

“There are no bad noble ladies.”

At least, not in front of Derrick.

When the planet perishes and the gods fall, the collapse of the magical realm leaves humanity without any protectors. Now, "Anomalies" and "Catastrophes" begin to invade the human realm . As the Dark Age descends, a soul from Blue Star (Earth) is unexpectedly transported into this dying realm.

In the world of daily full-throttle dedication to his studies, there's Itsuki, a high school boy. The reason he's putting in so much effort into his studies is to reunite with his first love, a girl named Amane, and go on a date with her. While he's immersed in these study-centric days, by a twist of fate, he ends up living together with Amane and her sisters, Shion and Mone...!?

The middle boss of the AAA-class game produced by the company. The villain who dies 999 times out of 1,000 times. Deculein.
That person, was me now.
“You’re going to die on almost every route.”
Deculein, like all villains, inevitably dies.
[First and foremost survival goal: Be what the game requires you to be]
I’ll have to survive even if it means twisting my fate if I am destined to die.

Local bullies tormented Kotaro when he was a youngster.
They were the skilled wrestler Akari.
Kanae, a basketball prodigy, and Shigure, a prodigy in video games.

Every day, Kotaro competed against these three guys in their respective sports with the intention of winning. Unfortunately, he was no match for them.

As a senior in high school, Kotaro now has another opportunity to confront them and exact his retribution...!

But he will discover a secret that he never would have expected....

The only one who can support them is... me?

Tendou Souma, who spends his days in idle monotony, has two "idols." His online idol is Henrietta, a hugely popular VTuber. His real-life idol is Hiyori Yatsumi, an idol and voice actress. Souma's university life was supposed to be centered around supporting these two idols... But then, one of his idols unexpectedly moves into the room next door!? Excited by this dream-like turn of events, Soma is thrilled, but what he discovers is the disappointing true nature of his idol...

Can sensei be the heroine? Please?

Due to a traumatic experience, I have a distrust of people called “sensei”. I, Saiki Makoto, was called by after school by the most popular and beautiful teacher at my school, Fujiki Maka-sensei.

“I… love you” Eh– a confession out of the blue!? “Until you say you love me, I will continue to pursue you”

Ever since then, I’ve been called by for “guidance counselling” after school, somehow watched AV together, being given excessive skin-ship, went on dates together. Over time, I gradually became conscious of Sensei…? But isn’t it bad for Sensei to go out with her student?

A romance that is absolutely NG, the forbidden love between us two.

Lesson start!

Alternative Raw: http://seiga.nicovideo.jp/comic/40299

From MangaHelpers :
High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, powerful others in this world aren't as thrilled to have him there, and they kick him to the edge of the world just as Tsukuyomi declares that he must leave Makoto to find his own way. Now it's up to Makoto to find his own way.

“Please teach us naughty things.” One day, Itsuki is transported to another world, where he is confronted by sisters who serve the goddess. In order to return to the real world, he must give them practical sex education!

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)