GuessAnime.

1. Tensei shitara Slime Datta Ken

After being killed by a passing robber, a normal 37-year-old guy finds himself reincarnated in another world as a blind slime with unique abilities. He takes up a new name and calls himself "Rimuru Tempest," which he thought of after meeting his new friend, "catastrophe-level" Storm Dragon Verudora. There, he begins his new slime-like life in another world with his increasing number of minions by his side.

That Time I Got Reincarnated as a Slime is currently publishing . It is also Known as: 転生したらスライムだった件, Regarding Reincarnated to Slime, Re: My Reincarnation as a Slime

2. Yoku Wakaranai keredo Isekai ni Tensei Shiteita You Desu

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!

This Is Screwed Up, but I Was Reincarnated as a GIRL in Another World! is currently publishing . It is also Known as: よくわからないけれど異世界に転生していたようです, I Don't Really Get It, but It Looks like I Was Reincarnated in an Another World

3. Ranma ½

In China, there lies a famous training springs, a place where martial artists can hone their skills to great levels. Unfortunately, the springs are also cursed! Teenage martial artist Ranma falls into the "spring of drowned girl" and now changes into a woman every time he's splashed with cold water. That doesn't stop his father from engaging him to Akane, the daughter of an old friend and a tough girl who has better thing to do than worry about boys. But Akane isn't the only girl who has a chance for Ranma's affections -- two other girls have also been betrothed to him. But Ranma has better things to do than worry about his love life -- such as making a plethora of crazy rivals and even more suitors!

Ranma ½ is finished and has 38 Volumes and 407 Chapters. It is also Known as: らんま½, Ranma ½

4. Onii-chan wa Oshimai

Mahiro Oyama was just a normal erotic-game loving dude...until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him...with a disastrous outcome, as far as Mahiro's concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing's for sure...life is going to get a whole lot weirder from here on out!

Onimai: I'm Now Your Sister! is currently publishing . It is also Known as: お兄ちゃんはおしまい, Onii-chan is Done For

5. Boku wa Mari no Naka

The manga follows an "angel-like" beautiful high school girl with a certain secret she has been hiding from everyone, and an idle hikikomori young man; the highlight of his day is seeing Mari at the convenience store. The story begins as Mari wakes up in her room, but something feel amiss about the room and even her own body.

Inside Mari is finished and has 9 Volumes and 80 Chapters. It is also Known as: ぼくは麻理のなか, I'm in Mari

6. 4 Cut Hero

The Hero has defeated the Demon King! But the Princess he meant to save turned out to be a Prince. NEETdom, here he comes, but a life of relaxation surrounded by animes is a pretty sweet deal.

Unfortunately, he gets caught up in millennia old legends, curses, and a twisted plot involving multiple Kingdoms and many dragons. Through and through, though, he'll follow a path of whimsy, even if that involves him palling it up with "villains".

4 Cut Hero is currently publishing .

7. Marriagetoxin

A hitman and a marriage swindler set out on the world’s most grueling battle for marriage! Gero is a young man from a clan of hitmen, which has been in existence for hundreds of years. As someone who’s never gone to school and lived his life dealing in the dark side of the business, he considers himself to have “no prospects with women” and marriage as “something not for him.” However, one day, in fear that their lineage would dissolve, his clan warns Gero that if he doesn’t marry and produce an heir, they would have no choice but to…force his little sister into doing “that.” Driven to his wits’ end, Gero asks the target of his work, a marriage swindler, to…

MARRIAGETOXIN is currently publishing . It is also Known as: マリッジトキシン, Marriage Toxin, マリッジトキシン

8. Akuyaku Reijou Tensei Ojisan

The manga centers on a 52-year-old government worker involved in a car accident who finds himself reborn in a world like an otome game.

Middle-Aged Man's Noble Daughter Reincarnation is currently publishing . It is also Known as: 悪役令嬢転生おじさん, The Old Man Reincarnated as a Villainess, Akuyaku Reijou Tensei Oji-san

9. A Barbarian Was Admitted to the Academy

The protagonist is Lee Soo-jin, a college student who loved playing a role-playing game called “Academy of Magic”. One day, he wakes up in the body of Rina, a secondary character in the game who was a barbarian warrior from a savage tribe. He discovers that Rina was destined to come to a bad end, being captured and tortured by the evil empress. She decides to escape this fate and enroll in the magic academy, where she meets several characters from the game, including the crown prince, the black knight, the white wizard and the empress herself.

A Barbarian Was Admitted to the Academy is currently publishing . It is also Known as: A Barbarian Entered the Academy, Entered the Academy as a Barbarian, Варвар поступил в академию, アカデミーにオランケが入学した

10. I Quit the Hero's Party

Similar Manga like I Quit the Hero's Party

I Quit the Hero's Party is currently publishing . It is also Known as: 勇者パーティー辞めます。, I Quit the Heroes’ Party

11. Kenja no Deshi wo Nanoru Kenja The Comic

Sakimori Kagami plays a VRMMORPG called Arch Earth Online. He is a veteran player with the name and appearance similar to an elderly bearded wizard from a certain book about a ring. One day he purchases an appearance change item as a last resort to spend expiring currency and gets the idea of choosing what he would want to look like if his character was ever a girl. Falling asleep should have suspended the game, but Kagami wakes up still online and feels the game has has gotten a bit more realistic. Did Arch Earth Online finally get a long-awaited update?

She professed herself the pupil of the wise man is currently publishing . It is also Known as: 賢者の弟子を名乗る賢者 THE COMIC, Kenja no Deshi wo Nanoru Kenja The Comic

12. Youjo Senki

On the front line of the war, there's a little girl. Blond hair, blue eyes and porcelain white skin, she commands the army with lisping voice. Her name is Tanya Degurechaff. But in reality, she is one of Japan's most elite salarymen, reborn as a little girl after angering a mysterious being X who calls himself "God." And this little girl, who prioritize over anything else efficiency and her own career, will become the most dangerous being amongst the sorcerers of the imperial army...

The Saga of Tanya the Evil is currently publishing . It is also Known as: 幼女戦記, The Military Chronicles of a Little Girl

13. Mabeopsonyeo Ajeossi

202X. In the back alleys of Seoul, South Korea… He looked down at the heroes under his feet—the heroes who adorned themselves in a variety of colorful clothes, as if they were K-pop idols on TV. Those heroes? They were crawling beneath him, their gaudy outfits smeared with dirt. That was the true nature of being a hero. He hoped the individuals before him learned that lesson well. It was time to ensure they never forgot it. As a magical girl, he swung his hammer down. This is a bright story. The story of a man reclaiming his light.

Mr. Magical Girl is currently publishing . It is also Known as: Magical Girl Ajussi

14. The Story of a Yakuza Boss Reborn as a Little Girl

Similar Manga like The Story of a Yakuza Boss Reborn as a Little Girl

The Story of a Yakuza Boss Reborn as a Little Girl is currently publishing . It is also Known as: ヤクザの大親分が幼女に生まれ変わった話, The story of a Yakuza's most senior boss reborn as a little girl, Loli Yakuza

15. Boku Girl

Suzushiro Mizuki is a 1st year high school student who has the difficulty of constantly being mistaken for a girl. It's so bad that he's endlessly rebuffing the confessions of many men. Even the girl he has a crush on seems to think of him more as one of the girls rather than as a potential love interest.

Meanwhile, the trickster god Loki has grown bored with playing her tricks on her fellow gods. Turning her attention to the mortal world, she targets Mizuki for her next round of fun. The result: Mizuki wakes up with budding breasts and a missing part of his anatomy.

What else is in store for Mizuki and how will he deal with it?

Boku Girl is finished and has 11 Volumes and 107 Chapters. It is also Known as: ボクガール, Boku Girl

16. Okaeri Alice

The manga centers on three shy middle school students: Youhei, Kei, and Yui. All three have been together since kindergarten, and are childhood friends. As Youhei starts to become conscious that Yui is a girl, he witnesses a scene that he can't quite believe.

Welcome Back Alice is finished and has 7 Volumes and 40 Chapters. It is also Known as: おかえりアリス, Okaeri Alice

17. Mayonaka no Cross Method

Kamiya Hiroki always thought women had it easy. This thought was throttled by the fact that his 24-year-old sister does not work and plays games all day. Why couldn't he have it this easy? He wanted to become a woman and be lazy like his sister. After blogging about his rants about his sister online, a mysterious reader comments on his blog, stating that there are ways to swap bodies with others. This would bring Hiroki's dream of becoming a woman to reality . Unfortunately for Hiroki, swapping bodies had unintended consequences when he returned to his own body.

Mayonaka no Cross Method is finished and has 4 Volumes and 27 Chapters. It is also Known as: 真夜中のＸ儀典（クロスメソッド）, Mayonaka no X Method, Mayonaka no X Giten, "X" Method In The Dead Of Night, クロスメソッド

18. Nullitas: Itsuwari no Hanayome

One day, a girl who was raised as a boy has her entire life flipped upside down...

A nameless boy who dreams of becoming a knight works as a servant for the renowned Romagnolo family. One day when he is seventeen years old, the boy faces his first monthly period and his mother tells him that actually, he is a girl. She is Count Romagnolo's illegitimate child and her mother secretly raised her as a boy to protect her.

When the count finds out about his illegitimate child, he decides to use her as a pawn to protect his daughter, Maylene, from an unfavorable engagement. In that instant, the child who has lived for seventeen years without a name is given one, and her life begins to change dramatically. Her name is "Nullitas," which means "nothing."

Nullitas ~The Counterfeit Bride~ is currently publishing . It is also Known as: ヌリタス～偽りの花嫁～, Nullitas: Jeolban'eui Baegjag Yeong'ae, Nullitas: The Counterfeit Bride, Nuritas: False novia, Nulliitas: The Half-Blood Royalty, 娜丽塔斯·一半的伯爵小姐