A poor high school boy, Izuki Tomonari, got caught up in a kidnapping attempt on Hinako Konohana, a young lady from one of Japan's largest conglomerates. On the surface, Hinako appears to be a brilliant and beautiful young woman, but in reality, she is a lazy girl with no life skills. However, due to family reasons, Hinako has to play the role of the "perfect young lady" at school. Wanting to protect her, Izuki took on the job of caring for her. Eventually, Hinako began to spoil Izuki with all her might. "I don't want... Izuki to leave my side right now." This is a love story that begins beyond the master-servant relationship featuring a princess with a beautiful facade.

"Was it better than being with her?"

Haruka, a high school student, was living a happy life with his girlfriend, Suzuka. However, there was a reason why Haruka couldn’t bring himself to openly express his love for Suzuka.

Romantically, he loved Suzuka, but the person with whom Haruka felt the strongest sexual attraction was his childhood friend, the glamour model Ria.

Despite his self-loathing, Haru tried to love Suzuka, but one day, Ria — who was supposed to be living far away — appeared right before his eyes.

As if she could see right through Haru’s feelings, Ria entwined her heart with his using her alluring body.

"It’s fine with me, Haru-kun. I’ll keep it a secret from your girlfriend."

Through this sweet temptation, Haru’s happy daily life begins to crumble away...

Ryu Kang-Min is a member of the massive killer organization 'Batala.' This is a place from which there is no escape once you enter. Then one day, he receives a special commission in exchange for 'freedom.' The mission is to kill a 'target located in Korea.' Ryu returns to Korea for his freedom and, as a warm-up, eliminates the organization's 'traitor' first. Having completed his brief warm-up, he begins the mission in earnest…

Jade, an adventurer who fell in love with the guild receptionist. "I want to talk to her...!" and Jade, who continued to go to the guild with all her heart, was someday called a "hero." Super hero and cool receptionist stir up, too deep love comedy!

Mark Stuart had realized something terrifying: he had been reincarnated as the mid-boss in a game! In the original game, he was fated to be condemned by his daughter, Forsina, who was known as the “Ice Princess.”
Reflecting on his past coldness toward her, he resolves to change his fate by earning her affection. Through his thoughtfulness and his actions as a duke, his daughter begins to regain her love and trust in her father, but he ends up going too far, and her love slowly becomes overwhelmingly heavy!?

Betrayed by her team and abandoned to die in a dungeon, timid C-rank hunter Cho-i Hyeon discovers a cursed ring that keeps her alive by endlessly regenerating her body. Time stretches into years as she’s killed over and over, unable to escape. When she finally does, she’s no longer the girl who was left behind. Stronger, colder, and haunted by something growing inside her, she wants answers -- and revenge. But the ring may have a will of its own, and its true cost is only beginning to surface. Whatever it is, it may already be too late to stop.

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

Hinako, a friend of Asahi's older sister, is a frequent guest at the home of the high school boy. She always misleads his mind with her suggestive attitude while treating him like a little brother...or rather, pet? A love story between a gal who has a bugged sense of proximity and an otaku guy who acts like her parent!

Minjun Kim, an ordinary high school senior in Korea, was suddenly summoned to another world, where he became a dark mage.

Determined to return home, he overcame all sorts of hardships and saved the other world with black magic before leaving all his wealth and glory as a hero behind to return to Earth.

However, before he could fully enjoy his life, a problem arose. A dungeon break had occured and monsters came pouring out, threatening his comfortable days.

Therefore, Minjun, who had just returned to earth, had no choice but to… enlist on the very next day!!!

The strongest hero of humanity, Kim Sung Bin.

He threw everything on the line and fought… but he still couldn’t prevent the destruction of the world.

However, his legend has just begun as he returns 20 years into the past.

“I’ll definitely… kill it this time.”

Now fully equipped with overwhelming power and experience, the hero’s raid isn’t over yet!

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...!

Suddenly summoned to another world, former office lady Fukuyose Mahiru becomes a lunchlady in order to cover her living expenses, as well as gather information. Then one day, she gets her hopes up when she hears a rumor that the genius Magician Randy may hold a hint to help return her to her original world——.

"To find the practitioner than summoned you here, we must uncover the motives behind it."

Things become messy after it's determined Mahiru holds a great amount of magical power, and must therefore cohabitate with Randy?! And on top of that, he finds eating to be too troublesome, making him the ultimate picky eater——!

Original Web Novel: https://ncode.syosetu.com/n8472ex/
Original Light Novel: https://bookwalker.jp/deb24fce40-d2ca-4eb1-b837-86557d145a76/

He learnt the strongest martial arts only to be killed and be reincarnated as a rural village officer as Master Baek, The One Hit Teacher!

Transfer student, Aoba Shunsuke, arrived at Sunshine School only to find the premises empty. He was secretly gleeful to be the first to reach the school, oblivious to the fact that it was Foundation Day and a rest day for the institution. At that moment, a big-sized "L"(Eru) beauty by the name of Natsumi appeared before him and the two of them hit off together even though Shunsuke was so much smaller than her. Shunsuke's mother runs a women's apparel busines but the shop is in need of manpower. Shunsuke offers to help out at the shop but fumbles a lot because he does not know how to interact with the ladies. Eru decides to step in and help out around the shop and this pleases Shunsuke's mother. This is a romance story that shares the joys and woes of the "SL" combi between Shunsuke and Eru.

The Kabocha Wine won the 1983 Kodansha Manga award for shounen.

From Dynasty Scans:

10 years ago, high-school student Sanpeita dreamed he was engaged to a beautiful girl. One morning, an unknown homely girl suddenly pressed him for marriage. The homely girl was named Kemeko.
In order to escape, Sanpeita left for school where Kemeko followed and showed up with an uproar. A larger disturbance was when Sanpeita was targeted by a rice cooker on the school's rooftop.
As Sanpeita and his childhood friend Izumi were being attacked by the rice cooker, Kemeko saved them both. What is the girl's true shape!?

Shota Iijima picked up erotic books during his childhood and suffers from a severe foreign sister fetish.

Thereafter, from the years between his age of 12 to 15, he masturbated 999 times. For his 1000th round of masturbation, he had been transferred to a different world.

And Shota is sold as a slave.

A paradise for women and hell for men… Valhalla, the penis mansion.

The daughter of a duke, the stuttering Maximilian, married a knight of lowly status at her father’s coercion.

After their first night, her husband departed for an expedition without another word.

He comes back three years later, this time as a famous knight in the whole continent.

How would Maximilian face him on his return?

"The more I think of you, the more lonely and lonely I become. I don't know why I can't quit even though it's so painful."

A fantasy story about Kiska, a boy who is mistreated by the villagers. He manages to survive thanks to his childhood friend Namia, who was the only one by his side. One day, Namia is murdered by three men, and Kiska is accused of the crime and banished to an inescapable class S dungeon. However, he finds himself in a different world where he can use "Save and Reset" to get back on his feet no matter how many times he dies. The story is about Kiska's quest for revenge against those who wronged him and his friend

One day, school teachers come as freeloaders to the inn run by his parents!? Kazami Hiro, a high school boy, decides to take care of the inn and his future!? Under one roof, The forbidden harem romantic comedy begins!!

From ANN:

The story revolves around Tomoya Mizuhara, a 13-year-old boy who suddenly gains a big sister when his father remarries. 17-year-old Ichika is a little strange, and her affection for Tomoya is rather overwhelming, if not scary. On top of things, Ichika's friend Ruri is the ultimate sadist. Then there is Ichika's big-breasted quarter-Japanese friend Marina.