It's April of my third and final year in high school... But the beautiful girl I have a crush on is my best friend's girlfriend. Thus begins my year of treading on the dangerous ground...

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.

The youngest A-rank adventurer, child prodigy Kaiser, finds three babies who were the only survivor of a destroyed village. Then he decided to give up his job as an adventurer and raise them. Over time, the girls grow brightly and show exceptional talents in fencing, magic and management. However, these girls also seem to love their father, Kaiser!

Orignal webnovel: https://ncode.syosetu.com/n2223fo/

Yukito, the son of a questionable cult leader, lost his life due to the cult's ridiculous training practices. Now to his surprise, he was reincarnated into another world!
It was an ideal world for him without the concept of "God" or "religion" BUT...!

A unique "reincarnating in other world" adventure begins: creating a "religion" in a world without God?!

Hinata is a high school student who reincarnated into a different world and became a hero by the power of God. He defeated the Demon King with the help of the dark elf Mariabelle and other friends. Thus he safely fulfilled the wishes of God and returned to this world.

One month after Hinata returned to this world, for some reason Mariabelle also came here from the other world !! The reason she came here is to be with her beloved Hinata !! ~~~ With heavy love and a teaspoon of jealousy, she attacked Hinata every time he refused !! (in many ways).

Will Hinata, who has decided to live with the Yandere Mariabelle, be able to live safely (?) !! A sweet and thick romantic comedy woven around the dark elf beauty's slightly heavy schizophrenic love !!!

On his very first day of starting high school, Namito Kominato's homeroom teacher has him sit behind a strange girl who wears a paper bag over her head and is always soaking wet with sweat. Her name is Samidare Kamiyama, a extremely shy girl with severe social anxiety. Ultimately, she meets Hinata Arai (the student council president who's kind and helpful, but alarmingly obsessed with her uniform) and Harusame Amano (a girl who only speaks at the magical girl panels at anime conventions). These three unfortunate, but beautiful girls form a "conversation club", opening the curtain on this somewhat pitiful and comedic tale of adolescent romance!

Kirishima Haruna is a member of an idol group. But after being told that she would not be part of the main team due to her poor sales, she started to crumble as her debt stacked up with lesson fees. "How did it come to this?!" screams the young girl... while holding a tuna between her thighs.

Junpei Ichinose, a student at a magic school in Tokyo, is a dropout who has never discovered his magic aptitude. Suddenly, the beautiful witch Meryl appears before him and tells him, "I need your power, the reincarnation of the Demon King". Junpei finds out that he has the power of the Demon King. He learns that he has the power of the Demon King, and his secret is revealed to Sonia, a beautiful girl who is a descendant of a brave warrior. Junpei, who has no intention of becoming a Demon King, persuades Sonia to teach him how to use his power properly. However, the Demon King's power is the strongest and worst "erotic magic"!

The harem school battle to master H-magic with beautiful girls is about to begin!

From ANN:
Kazuki Hayashizaki is a sword master who, after receiving a mysterious sign from a god-demon that uses summon magic, enters the magic department of the national knight academy. Though he was supposed to be the successor to the Hayashizaki sword technique, he begins a magic class with all girls. He will use both sword and summoning in the school battle coliseum.

I am cute, but I was a middle-aged researcher in my previous life?!
Surviving in another world with magic and sciences!!
The orphan Ren was riding the carriage after being sold, when she got involved into an accident, and got her previous life's memories back!
"I was... a middle-aged man!"
Indeed, she was a researcher in his thirties in her previous life, and had been living as an orphan girl up to now!
Ren will make use of her talents in magic and knowledge in science to survive in this harsh world in order to escape from the investor who bought her!

Kasukabe Hayato has been accepted to Tokyo U on his first try. Receiving news of his grandmother's death, he returns to his childhood home, Cafe Terrace Familia, for the first time in three years to find five strange girls there who claim to be "Grandma's Family"! Hayato's unexpected life in a seaside town with these five girls of fate begins here!

In this handsome harem under one roof by Koji Seo of Suzuka, Kimi no Iru Machi, and Fuuka, which girl will you fall in love with? A seaside love comedy with too many heroines!

A certain village was attacked by a monster army and fell into a dire situation. At that moment, the strongest hero, Eric, appeared and instantly mowed down the enemies. However, due to his overwhelming strength, his equipment couldn’t withstand the battle, and he was cursed with the tragic fate of becoming naked after every fight…!? The curtain opens on a liberating fully loaded adventure craft comedy!

Bi-Kwang is a handsome young warrior who becomes a drooling mess whenever he sees a pretty girl. Out on the road he meets an extraordinary swordfighter with no name who is searching for a legendary master warrior. Bi-Kwang promises to aid the swordfighter if he lets Bi-Kwang meet his beautiful sister. Of course, it turns out the swordfighter is the sister, Hwa-Rin Dahm, and she must switch identities to keep the plot moving along. Bi-Kwang is immediately smitten, and thus we have a triangle involving only two people.

This manhwa was made into a MMORPG.

A story about a rabbit girl named Shiro and her owner.

The Author made many ntr doujins

Makoto and Shinobu are my two childhood friends whom I haven't seen in years, but who had always been admired as being the manliest of men, even when they were kids. I, Ryunosuke, am going to be attending a high class school that was once an all girls school, but has slowly started to admit boys. Makoto and Shinobu were already attending there, so the three of us will now be sharing a room together in the school dormitory. I'm looking forward to the start of my rough but manly school life. However, when I get there, it turns out that they are both girls! GIRLS!! I now have to share a room with two people who I, for my entire life, had always thought were boys! They then tell me that it's a secret that they are really girls and that they've been pretending to be boys. Now I will have to help them keep up this rouse. What am I going to do??!!

Thus begins the story of Ryunosuke's manly school days which will now be filled with days of plumpness, sexiness, and the maximum amount of naughty slip-ups!!

After losing his life because of his own womanizing badness, the reincarnated former Great Sage Akiba Kenji contracts with the Great Demon Gremory in order to become the Great Sage once again, but that contract provides the opportunity for his MAX-level yandere followers, who continued loving him even after losing him, to find him, and they won't let him get away......!? All heroines confirmed yanderes!

Ichiyoshi continues to work at a chocolate factory, always keeping in mind what is "best" for him. One Christmas night, on his way home, he finds a mysterious superball that rolls out of the darkness...

Gekko Iwasaki, a high-school student, is selected as executor of "Moonlight Ordinance" and fights against the residents. In this fairy tale, there is a world which is strangely affected by blue moonlight once in dozens of years. "Moonlight Ordinance" is a rule to restore the world to its former condition.

The princess who's been held captive by the Demon Lord's army is scheduled to be executed by the Demon Lord's relentless torture!

The adventurer Anne is hit by the Peepee Devil's beam and grows a thing. Anne's thing stands up out of anger at the Peepee Devil! The curtain opens on a violently crazy ☆ fantasy comedy!