I was cursed to become a woman in place of the prince, and then he proposed to me?! My best friend from childhood, the high-spec Prince Vincent, and me, his follower Renoa. Though I've always been a loyal yes-man… Even if you're taking responsibility for me, I can't accept that proposal! The infatuating love story between a troublesome prince and his scapegoat attendant!
Original Web Novel: https://ncode.syosetu.com/n1090ff/

A popular guy that's secretly interested in cosmetics asks to practice makeup on his dull childhood friend and he ends up looking cute?!

Links:
Author's Twitter: https://twitter.com/azusa_banjo
Author's Pixiv: https://www.pixiv.net/en/users/5279612

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.

Self Published WebManga Presented by Grinp-Circle

A TS Slice of Life Comedy about a brother who was transformed into a girl by his little sister strange drugs.

As the master of the School of Unholy Arts and as the undefeated Unmasked Demon, MookHyang unfortunately falls to a strange fantasy world by the magic of his enemies (School of Blood Arts). In the new world of elf, sorcerer, knight, and dragon, MookHyang’s adventure of finding a way back to his old world (Murim) unfolds.

Tatsumi enters highschool with his childhood friend Amasawa Kokoro, nickname Ama-chin, who is a extremely feminine looking trouser-wearing boy that likes to mess with peoples expectations of his gender.

A boy who used to be abusive to girls wakes up one day as one.

“I'll go back being a boy soon,” he thought, however that was not the case. Follow Akira as he grows and learns little by little to accept the puzzling changings in her surroundings and her heart.

Although she had been a promising practitioner of kendo in the past, due to an accident she was forced to lead a plain life. After Seo Yuri gets into a car accident during a trip back home, she reincarnates into the novel, "The Song of the Moon," and becomes the elder twin sister of a side character who meets a destructive ending-- Selena. Selena hopes to prevent the destruction of her family, however, she is forced to take the place of her runaway brother, Celestine, in the knights’ squadron! Will she be able to avoid the villainous Crown Prince, Ignis, and survive?!

Kang Ji-hoon, an ordinary high school student who died in a painful accident, finds out in the underworld that he is actually a ‘Water Spirit King mistakenly born as a human’. “Making water spirits? How do you do that?” The adventures of Elqueeness, the Water Spirit King who was mistakenly born as a human!

From Tokyopop:

In real life, Roto, Boromid and Ah-Dol are average kids with average problems, but in the virtual world of Lost Saga, they're heroes. They might even become legends... if they can stop bickering long enough to level up. Whether it's werewolves running rampant or a gorgeous pair of troublesome thieves, our boys must be ready for anything, because in Lost Saga nothing is what it seems and murder can happen with a click of a mouse.

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The series centers on the main character Jang-Gun and his friends along with their virtual reality avatars in the computer game world called "Lost Saga". When Jang-Gun logs on as a different character, he "Creates" an AI with a personality from the hacked disk he found when renewing his appearance for his once a year renewal process. Yureka is a flutter-brained, but advanced, AI with powerful stats and a real-life doppelganger. It is his turn to see just how deep his immersion in the virtual world goes.

Mitsuki Kou is such a feared PVP gamer that he's earned the nickname "Crim the Headhunter" in some circles. His next game to take over? "Destiny Unchain Online", a brand new VRMMO game developed by none other than Kou's father. But, no new game on release day is without its bugs - namely, Kou glitches to the middle of nowhere, and his vampire avatar is turned into a girl! A story for all of the people who through games have met new friends and aimed for the top... start!

A dull old man and his handsome best friend were summoned to another world by a naked goddess! However, because of the goddess's mischief, he has turned into a peerless beautiful girl?! To get back his body, he has to go on a journey with his best friend to defeat the demon king!! "An old man that became a beautiful girl" and "A handsome old man"! Let the madness filled another world journey rom-com begin!!

He became a magical girl, and his buddy fell in love with his magical girl form

Artist’s Twitter: https://twitter.com/isiyumi
Artist’s Pixiv: https://www.pixiv.net/en/users/1573847

Seeing it brings misfortune; defiling it brings a curse? Introducing a new era of strangeness, abandoning seriousness!

On a stormy day, a landslide destroys a fence, and siblings who ventured into a long-prohibited area encounter a terrifyingly bizarre creature...
"I'm a curse god, you know!? Don't you think anything of this grotesque form?!?"
The unflappable siblings, rather than being scared, casually call the creature "Dara-San" and grow fond of it!?

Seemingly scary but not at all! A new era of occult comedy that leaves seriousness behind.

Shizuku Ishiai, a 2nd year middle school student, loves dancing, but is bad at expressing herself, so she crossdresses and posts videos of her dances on the popular website "Smile Douga", under the alias "Ai". And she had declared the "dancing prince", Hayate, her rival. But, after a few unexpected events, and her attempts to best him, she's somehow thrown into an idol unit with him; furthermore, a MALE one?!

Kuroitsu Tohka is a research assistant at the Monster Develoment Department of the evil organization Agastia. However, the enemies she must fight at present are not heroes. "Problems just before a presentation at a big meeting", "Proposals thrown together in ten minutes", "Impossible demands from the higher-ups"... As long as there is good in this world, there will also be evil. This is a tale of those who fight an unseen battle in the shadows of this standoff between good and evil.

A mysterious command given to Tomita Yuzu, whose livelihood is assassination. "Kill the one you meet now." However, what appeared in front of me was another self ...!? An unpredictable "Hitman's" action comedy presented by Yokusaru Shibata and Makoto Sawa's "Blue Striker" duo !!

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!

Main character's childhood friend vanishes comes back to say goodbye to main character. Childhood friend gets attacked by something, main character dies in crossfire. Main character is reincarnated as the living weapon of the demon lord, while his childhood friend is apparently now the hero.

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!