Kisshioin Tsubaki aka the "Crimson Camellia", a beautiful lady reporter of the occult, wants to satisfy her intellectual curiosity by having a hands-on experience with every Yokai she can find.
Follow her in her travels, accompanied by her trusted cameraman Yokomizo-kun.

Haruma Kiki always dreamed of doing ballroom dance as the feminine "follower" role, but as she aged she only grew taller and taller, eventually causing her to give up ever looking good in a dress or anything ladylike. Now, as a second year in high school, she specializes in the masculine "leader" role—until one day, her partner suddenly leaves her. When Toribami Michiru, a short and pretty first year, shows up wanting to join the ballroom dance club, Kiki asks her to be her new partner, but Michiru reveals that she only plays the leader role—and she wants none other than Kiki as her partner.

Nagisa Ootsuki shed her former self out of shame from failing her highschool entrance exams. On her first day in her new highschool, who does she meet but the girl who made her fail the exam! How does Nagisa deal with these complicated emotions?

Author's twitter: https://twitter.com/sakuragi_ren

Kamiina Botan is a 20-year-old college student.
At the welcome party for the dorm she was assigned to, the dorm leader Ibuki gives her a highball to drink and she becomes tipsy, leading to her involvement with Ibuki from now on...
A tipsy teasing girl's comedy!

Official Manga Twitter: @Kamiina Botan: https://twitter.com/kamiinabotan

Mangaka's Twitter: @Hey 塀 : https://twitter.com/tonarinohey

Himeko Kurusugawa and Chikane Himemiya are two high-school girls at the prestigious Ototachibana Academy in the fictional Japanese village of Mahoroba. They are also the reincarnations of the solar and lunar mikos. When their ancient enemy the Orochi (the eight-headed Yamata no Orochi of Japanese folklore) rises once more the girls’ long-sealed personas awaken to defend the world!

'Kannazuki no Miko' Spin-off Manga and 4th alternate reincarnation of Himeko and Chikane.

Kannazuki No Miko - 1st alternate reincarnation
Kyoushiro To Towa No Sora - 2nd alternate reincarnation
Zettai Shoujo Seiiki Amnesian - 3rd alternate reincarnation

The everyday lives, games and hijinks of high-school girls at an all-girls school.

Ordinary office worker Oohashi Rei wakes up in the body of the protagonist of her favorite otome game, Revolution. To her delight, the first person to greet her is also her favorite character, Claire Francois–the main antagonist of the story! Now, Rei is determined to romance Claire instead of the game’s male leads. But how will her villainous lady love react to this new courtship?!

Links:
Author's Twitter: https://twitter.com/inori_narou - Tweets in English, Japanese, and Korean.
Artist's Twitter: https://twitter.com/aonoesu - Tweets only in Japanese.
Official English Novel: https://sevenseasentertainment.com/series/im-in-love-with-the-villainess-light-novel/

Anne-Sophia, the Princess who remembered her previous life at a young age, as well as her old self’s intense love of magic, set off to live out her fantasies in this fantasy world.

One day, during a magical mishap, she stumbled upon a scene where her brother Algard was breaking off his engagement to his fiancee, Euphilia.

What nobody could have foreseen is that this strange meeting would end up changing the course of history.

Nanoha and Chidori are best friends. They're also dating, but it's a secret, so don't tell anyone!

High school girl Hinako is living a quiet life in a seaside town, but she feels somewhat detached from her friends during the summer months when she is reminded of when her family died years ago. One day, she meets Shiori, a mysterious girl who reminds her of the ocean, especially when it comes to her translucent blue eyes, but Shiori soon reveals that she is actually a mermaid who has been looking for Hinako for a long time.

Links:
Author's twitter: https://mobile.twitter.com/naekawa_sai

Our ages are different, our ways of life are different, everything is different. But...I just want to be with her.
Because I've never been in a miserable, tragic romance, I can say that unrequited love is fine.
I don't know why I fell in love with this person...it's a mystery.

They have different personalities, different ages, different ways of thinking, different looks, different everything.

This is the story of girls who clumsily make up for what's lacking in the other.

These are new side stories. Not a rewrite of the original serialized twitter comic.

Asumi-chan uses a lesbian brothel to try to find her childhood friend.

The continuation of Yuzu and Mei's story.

From MangaHelpers:
Nogawa Izumi is a good student, and a class representative, but she has an increasingly high libido. It's gotten to the point that she'll claim to feel bad during class, so she can run to the nurse's office and masturbate. When she learns that the Earth is being invaded by aliens that look like people dressed up as animals, it turns out her high sex drive may be able to help protect the Earth. The first time Izumi is attacked by the aliens, she is rescued by Usayama, a bunny alien whose race was their previous victim. Usayama gives her a swimsuit that will allow her to fight the aliens, but which also sends her constant arousal through the roof. The scientific organization that Usayama is affiliated with think that Izumi, with her high erotic level, may be the person they've been looking for to fight the aliens. Will Izumi be able to save the Earth?

Himari fell in love with the band and Sakura at the new student welcome party when the band performed.
Himari talked to Sakura, and she fell in love with her smile.

A story of two close friends living together.

Guy dies and reincarnates into another world as the female character he made.


Links:
Original Web Novel: https://ncode.syosetu.com/n7608cw/ (Japanese)

4-koma about an otaku girl and her friends.

Somebody wants the Earth! After being invaded for 6 times by monsters and aliens, Tokyo was damaged and almost destroyed. When Runna Minami meets an honor student, Mika Kujiraoka, the bishojo fighters of justice, Mikarun X, are born.
They transform themselves into giants and, without wearing anything, the two heroines fight against the various enemies.

Longing to be a normie, I, Renako Amaori, am finally making my high school debut after working so hard for it.

However due to my communcation impairment I have a gloomy aura, and after being in the normie group day in day out,
I got so exhausted and said "I can't do this anymore!", I've reached my limit!

During that time I accidentally met the top student of our school, perfect in face and figure unrivaled in sword and pen, our school's best high school girl, Mai Odzuka, and we found in each other someone who we could open up to and talk about our own troubles.
What a nice friend I made, now I can surely get back on my own feet... is what I thought!

"It seems that you, even as a girl, have made me fall in love with you."

"...What?!"

Mai suddenly confessed to me.

Wait! What about our friendship?!

Thus we have feelings we cannot tell each other, friendship or a romantic relationship, we're presenting each other the goods about them and put them into practice to see what kind of relationship works best for us.

Can I succeed, or will my best high school life ...!!

(Translated from official website by TZdY)