Kazuyoshi Ishii has had a bad day. The former director of K1, one of the world's greatest karate tournaments, was imprisoned for two years for tax evasion. Just as he is released and he can return to karate, he is struck by a truck.
However, just before his death, a talking cat appears before him. The cat explains that while Ishii is dead, it can give him a new life - so long as he can complete a task for it. With no other choice, Ishii agrees. Succumbing to his injuries, Ishii falls to the ground, dead.
At that moment, high school girl Kei Ichinose wakes up from a three-day coma.
Russian / Русский Spoiler

A sidesplitting gag manga that reimagines the monstrous kaiju from Ultraman as adorable high school girls!

After an inconclusive battle against his arch-enemy Ultraman, Alien Mefilas awakens in the Kaiju Graveyard as…a high school girl?! In this new body, Mefilas will face new battles, along with Eleking, Red King, and other kaiju reborn as cute school girls. Together, can they conquer the world?

An omnibus collection of interconnected short stories by Douman Seiman.

About a Chinese God in the modern century.

"One day, my girlfriend suddenly transformed into a man?!"
A fantasy-romantic comedy about a guy whose girlfriend turned into a boy and the messy antics that follow suit.

Albright, who was famous as “the strongest Black Knight”, was reincarnated as a girl, Maria, whose ribbon suited her well for same reason. Maria, 16 years old, is currently a maid in the Marquess of Urband family in attendance to the Daughter of the Marquees, Relena. After Relena became engaged to the 4th Prince, the area around Maria had gotten busier…

Links:

Original Web Novel (Raw)

Self Published WebManga Presented by Grinp-Circle (Now Become Official Published By Ichijinsha)

A TS Slice of Life Comedy about a brother who one morning, wakes up to find that he was transformed into a little girl by his younger sister's strange drugs.

*5th place of Tsugi Manga Awards, Category Webmanga

Drama CD : https://mangadex.directoryproxy.com/drama/1/drama-cd-onii-chan-wa-oshimai (With Subtitle)

Twitter

RAW2 (Seiga)

What would you do if you woke up in a new world with no memories? Better yet, waking up in two separate bodies; a male and a female! This is the story of our protagonist, Tyre. Although, it seems as luck isn’t on his side as he travels in search of ‘The Three Sacred Tools of Avalon’ to try and retrieve his memories...

Português
Spoiler

Türkçe Tanıtım
Spoiler

From a young age, Minami Harusumi has had recurring dreams of Veronica, a princess whose kingdom is on the verge of destruction. He believes them to be recollections of his past life, and that he is her reincarnation. Because of this, he is ridiculed by his classmates. One day, when the mockery escalates into bullying, he rediscovers magic—something Veronica had studied and used. Reassured his past life is not merely a fantasy, Minami tries to learn more about his past memories and the reason behind them...

Elisa, Princess of the Kingdom of Grandia, only purpose in life was to survive. She got married to Ginger, the Duke of Gwen, who is called the crazy mutt of Randall. She expected to be loved, but he didn’t care for her one bit. Then one day, the curse began. “This menstruation cycle is driving me crazy,” exclaimed Ginger in Elisa’s body.” Elisa blushing at Ginger’s words replies, “I’m also very troubled by ‘that’ thing I have to do every morning.” The curse of the devil had switched Elisa and her husband’s body! Will they be able to switch back?

Spanish:
Elijah, la princesa del Reino de Grandia, su único objetivo en la vida era sobrevivir. Estaba casada con el duque de Gwen Ginger, un loco de Landel. Esperaba recibir amor, pero él ni siquiera le prestó atención. Entonces, un día, comenzó la maldición.

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.

Russian / Русский
Spoiler

Brazilian Portuguese / Português Brasileiro
Spoiler

Reid, one of the six great heroes of legend, lost his life during a fight with a demon. Floating around in the afterlife, he met a suspicious goddess who assured him that he would live once again. When Reid opened his eyes, he discovered that he was reborn as a baby. Moreover, as the daughter of his former fellow comrades.

While Reid initially struggled to become a hero in his former life due to his half-demon heritage, he realizes that he has been reborn as the daughter of the legendary hero and the powerful saint. With the experience he gained from his past life, as well as the talents inherited from her parents, Nicole aims to become a hero yet again.

After quitting her job, Morioka Moriko became a NEET and got addicted to an online game. In that game, even a wilting woman in her thirties like her can become a young, handsome guy and Moriko's new adventure as Hayashi began.

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Manga is cancelled due to author’s health issue

In one of the worlds that exist within virtual reality, Kagami held the title of one of the Nine Sages, a position that placed him at the pinnacle of magicians. One day, he fell asleep in-game after pulling an all-nighter. When he opened his eyes, what he found was a world that was different to the one before… More important than anything else, was that the grizzled and dignified veteran’s body that he was used to, had now turned into an innocent little girl’s. If his true identity was leaked, honestly speaking it was a situation where it was very possible that the solemn image he had built up until now would be destroyed. And to deal with this problem, the excuse that he came up with was…

French/Français
Dans un des mondes de la réalité virtuelle, Kagami possède le titre d’un des Neuf Sages, le plaçant au sommet de tous les magiciens. Un jour, il s’endort pendant une session de nuit en pleine partie. Lorsqu’il ouvre les yeux, il découvre un monde différent de celui qu’il connait… Et bien plus important, son avatar, un vieux sage vétéran et à l’air digne, a été remplacé par une petite fille. Si sa véritable identité venait à être révélée, l’image qu’il a mis tant de temps à se créer auprès des gens serait détruite. Pour remédier à cela, l’excuse qu’il a trouvé est…

The day before 35-year old otaku lady Ryouko Hayakawa's birthday, she met her end by way of a traffic accident――――or at least, she was supposed to. But when she opened her eyes, she found herself in a fantasy world.

What's more, she had reincarnated as the blond-haired, blue-eyed seventh prince, Herscherik! Fully enjoying a leisurely prince life free from worldly cares as a prince, Herscherik finds the king of this great country despised by retainers and officials alike, with corruption running rampant; quite the unpleasant state of affairs. Realizing this at a mere 3-years of age, in order to save the country Herscherik will have to rely on the "office worker" skills and "conman ability" from their previous life and take action!

(Note: It is NOT BL)

Simo Häyhä's adventures continue after the Winter War.

In June 1941 Finland launches an attack to reclaim the territories lost to the Soviet Union in what ended up being called the Continuation War.

To drown men into dazzling pleasure and show them their loved ones in their dreams, that is a succubus. Due to an accident, a young 17 years old boy named Riichi Hourai is reincarnated into a succubus due to a misunderstanding by the Reincarnation Support Department. For a succubus to live, she squeezes out man’s life essence and must consume it but Riichi as a former man firmly refuses it and would rather die than do such behavior. Does a substitute for a life essence kind of food exist? There is! And surprisingly it’s milk!!

However, There’s no race called a cow in another world let alone drink milk from other races. Although the Reincarnation Support Department gave him a dairy cow under special circumstances, he risks his own life raising the cattle who will become his life line in a parallel world and survive there while resisting his succubus nature. Moreover, It seems the cow wasn’t just any ordinary creature… Contrary to his desire for a peaceful life, Riichi was dragged into conflicts that influenced the fate of the world without him noticing it. Though him and his best friend have both died in an accident and his best friend reincarnated a bit late, both of them haven’t noticed the existence of one another.

Can Riichi meet his best friend ever again?! Will their friendship be the same like their past life?! A romantic comedy with their new cheat forms starts here.

It was in the year 2800 of the Midgard calendar. Back then, there was a Overlord who once reigned supreme and had reached the very brink of subduing the world. Her name was Lufasu Mafaalu, a great woman dreaded as the Black-Winged Overlord. She was too strong, too fast, and too beautiful. However, she was defeated by Heroes who opposed her ferocity, and her ambition was brought to an end.

Or so went the story of our protagonist’s in-game character, whose body he now possesses for some reason in a world 200 years after Lufasu’s downfall. Follow our protagonist as he becomes unnecessarily feared by his surroundings and unnecessarily worshiped by his former subordinates as he―or now she―cheerfully travels around this fantasy world.

Russian / Русский Spoiler

A boy who loves genderswapping gets genderswapped, so he acts out his ideal genderswap girl.

Author's Twitter: https://twitter.com/bukky_kancolle

The life of daimyo Uesugi Kenshin commanded authority and fear during the Sengoku period of Japanese history. In this retelling, the powerful lord is reimagined as a woman.

Youta and Hikaru, a twin pair of siblings, have grown up together and been close all their life. Since their parents are gone from dusk til dawn running a bar, Youta has stepped into the role of housewife of the family, cooking, cleaning, and generally getting things done. His twin sister Hikaru has always had trouble showing emotion, thereby leading to people misunderstanding her and showing fear of her. One morning after certain things come to light about their family, Youta and Hikaru are involved in a car accident. Upon awakening, they find they've switched bodies!

What are the challenges of visiting a boy who became a girl to get along with his senior?
It is a work drawn with favourite attributes such as TS, Yuri and Blonde Twintail

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!

Adapted from web novel (raw)
https://ncode.syosetu.com/n4736dz/

September 11, 197x, In the whole Kantou region a magnitude 8-9 violent earthquake occurred. Scholars called it the great destruction of the Showa Era, but the people called it the earthquake from hell! Volcanoes erupted, buildings crumbled, Tokyo became decimated in a single day. The government, after failing to recover the city, abandons Tokyo and moves the capital. The survivors form a society with no laws. In this harsh lawless world emerges Jack, a 10 foot giant who annihilates anyone and anything in his path. The manga details his journey.

The numbering is from the Complete Edition, with around 20 Chapters per volume.

This is the story of a village where a deity is--on the day of the village festival, the deity endows a boy, Mao, with a destiny. That destiny is to live as a girl. In a small village where forests, lakes, fields, fish, insects, and flowers flourish, Mao, his sister, and his friend confront fate.

Miyoshi is always competing and losing against his childhood friend, Mamiya, who is good at everything. One day, Mamiya collapses from illness and is hospitalized for several weeks. When he returns to school, it turns out he is genetically female, and has decided to try living his life as a girl now much to Miyoshi's horror.

Chitose Morishige is a 12-year-old seventh-grader without a friend in the world. Her father, Professor Morishige, built a robot companion for his daughter to ease her loneliness.

The only problem is that Ichika Robata, the android, is so lifelike that Chitose believes she's a normal human girl who either ran away or was kidnapped by her father. Ichika attempts repeatedly to prove that she's a real robot, with hilariously disastrous results.

Published in Weekly Shounen Champion.

Mizuki gets confessed to by a boy in front of a special mirror. Legend has it, that if you confess to someone you like in front of that mirror your wish comes true.

There is a slight problem in this equation: Mizuki is just a very feminine looking boy.

Also, it seems that he caught the attention of the Norse Trickster God, Loki, while glancing into the mirror. Loki decides out of boredom to mess with Mizuki and turns him into a real girl.

French/Français
Suzushiro Mizuki est un lycéen en 1e année victime de quelques difficultés dans sa vie : en effet, les gens le confondent constamment avec une fille ! Les garçons qui l’entoure finisse toujours par lui déclarer leur flamme. Même la fille qu’il aime le voit plus comme une amie que comme un potentiel petit ami. Et pour couronner le tout, Loki, déesse des farces fatiguée d’embêter les dieux, décide de se tourner vers le monde des humains, faisant de Suzushiro sa cible. Résultat : Mizuki se réveille dans un corps amputé de la seule réelle preuve de sa masculinité. Comment va-t-il réussir à gérer tout ça ?

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Links:

Author's Twitter

This volume spinoff offers a new ending to the original series. Will Akira and Momoi switch back into each others bodies? Also included are a few one-shot stories.

Etou Shougo is a university student sharing an apartment with his male childhood friend Yoshizawa Natsuki. When Natsuki leaves to take part in a clinical trial Shougo didn't know he would be coming back as a girl! It looks like Natsuki won't turn back into a guy for a whole year. Rather than worrying about it pointlessly, why not have some fun with it instead?

Two childhood friends, a boy and a girl, used to share a secret magic. Now that they're in high school though... A story of secret love from an outstanding writer.

Yi Qiu is a salaryman in his 20s. After going to the wedding of his highschool crush, he becomes disillusioned as he thinks about the past. However, a sudden shocking event sends him back in time 10 years! ... as a girl named Ye Wen!? Yi Qiu faces another strange twist—his former self still exists!

【Am I still myself? Who exactly am I?】 What kind of sparks might ignite when he, as a girl, meets his male self?

Exactly what the title implies.

An original work by Ameno

• Author's Page

A sequel to Remix Heart that ties in what happens to Mai after the events in the manga and bridges the story for her appearance in BlazBlue Central Fiction

Imamura Hinata is a high school boy with a cute appearance.
Since his trauma with the first love, he wanted to be more manly than anybody else. But one day he woke up to something different...
The total opposite of his ideal male body!
Pandemic love comedy!

Trivia : Tensei Here Written as (転性) = (性) Means Gender, Not Tensei (転生) = Reincarnation/Re-Living (生)

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French/Français
Imamura Hinata est un jeune lycéen androgyne. Depuis son traumatisme avec son premier amour, il rêve d’être le plus viril de tous les hommes. Mais un jour, lorsqu’il se réveille, quelque chose en lui a changé… Tout le contraire d’un corps de rêve musclé ! Une comédie romantique contagieuse !

This is surely a story you've never thought of! The cartoon’s main character is called Yuan Xin. She’s an otaku who likes to immerse herself in a fantasy world. She, who likes to look at hot guys--after embarrassing herself in front of them in the school yard, decides to retaliate. Unexpectedly, during the crucial moment, an accident happened, and she crossed over to the game world!

This comic has converted to strip comic!

Normal City is set in the far future where mankind exists on other planets. The existence of ESPs is accepted- but only as a "tool" for the army.
(Warning, spoilers of vol. 2 and following volumes below)
Spoiler

Not: Chapterless series, released in volumes.