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/

Meguru Kaku is a normal high school student, except for the dreams he has about his previous life. One day, an unseasonal new student, Kotaro Kongochi, arrives. He is reunited with a friend from his previous life that he thought he would never meet, but something is wrong with him...?

A man is trapped in a loveless marriage. But as he is on verge of death, he suddenly experiences the medical phenomenon of a so-called "gender change". Reborn as a woman, his wife becomes his life coach.

A boy has become a magical girl, Kazana Sho is going to become more feminine to get stronger...

Naoki Tozawa is adamant in his aim to grow into a man among men, so he decided to go to an all-boys high school with a long history of providing strong and tenacious men for society. However, he is shocked and dismayed when he discovers that after a year of attending the school, many of the students have started coming to school dressed as girls. Rumor has it that the cause of this is a member of the photography club, leading Naoki to confront Ueda, a boy in the club who makes a very convincing girl.

To Chie Souma, a female college student, every day feels depressing when she has no luck with job hunting. She’d much rather end up in an alternate universe, just like in her beloved tripping into another world novels...... Just as she was dreaming of escaping this reality, one day she actually trips into another world! It might be too dangerous in a female body to survive in this world. Chie decides to use the knowledge that she’s gained from reading, lie about her gender, and become “Souma the scholar”, but---!? A manga adaptation of a strategy manual style fantasy.

A violent and muscular boy who dreams in becoming a national champion, unexpectedly turns into a cute girl, how will “she” achieve “her”dreams?

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.

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.

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.

One day, high school student Kakeru who was young and told the end of the world in a traffic accident.
But he noticed he was reincarnated into a fantasy world,
Moreover, it was a village full of shota without women and adults!

Tamaru, a small, baby-faced "cute" boy, is in love with Morinaga, a tall, cool girl. Tamaru-kun thinks he's not good enough for her, but one day he sees Morinaga in a way that is too unexpected for him…? A love comedy full of "cute" things you can't tell anyone! ☆

Artist’s Twitter: https://twitter.com/iunosu
Artist’s Pixiv: https://www.pixiv.net/en/users/17576712
Alternate Nicovideo raws: https://seiga.nicovideo.jp/comic/46465

Takushi Hatsujou had played with a twin brother and sister when they were all kids, and he fell in love with the sister, culminating in his asking for her hand in marriage when they grew up, to which she agreed. However, they were torn apart for 10 years until Takushi is finally able to get his grandfather's permission to marry her. When they finally reunite, he is surprised to find they both look like girls. Although he knows one of them is cross-dressing, he can't tell which is a guy and which is a girl.

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.

One day, due to God's mistake, Tomoaki Akinoi's life was accidentally snatched away. Though he gratefully accepted the cheat offered as an apology and reincarnated, he was reborn as a female elf! Then time passed, and Tomoaki now works as the intelligent and beautiful receptionist named Ilya in the Luneville branch of the Guild Association. In a world of swords and magic, her job in the guild begins today.

This is the story of a "princess" who torments the whole world.
She is loved by God, she has beautiful hair, and she wields a violent blade. She was the prettiest young lady in the kingdom, but she was also the most powerful of mercenaries, nicknamed "Savage Fang." All of them are now beginning to be trampled by a girl who defies expectations.

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.

The elementary schoolers Yuuta and Yui had their body swapped when Yuuta fell down from a tree. It's already been three years, and now they're in middle school. How will they co-operate in dealing with this as they grow up?

Ever since he was a boy, Matsuri Kazamaki has worked as an exorcist. Because his childhood friend Suzu Kanade attracts malicious spirits called ayakashi like moths to a flame, Matsuri is tasked with slaying any with ill intentions.

One day, an ayakashi named Shirogane notices the budding romance between these two childhood friends. Eager to both devour Suzu and foil Matsuri’s chance at love, he performs a forbidden spell...

The newest series by Kentaro Yabuki, creator of Black Cat and artist behind To Love Ru and Darling in the Franxx.