On the planet of Hekiou, there is a continuing war between the first wave of immigrants and the second. An important section of the military uses a native creature, the Niebass, to give its soldiers translocation abilities. These soldiers are all women, with the alien creature transplanted into their wombs. Some people see this practice as a violation of human women by aliens, and Mana Oga's boyfriend has a similar perspective on the matter. Mana Oga is a new soldier in this section, and the story follows her and the other women in her group who accept the alien creatures into their wombs in order to defend their homes.

Note: Won Nihon SF Taisho Award in 2016. Was nominated for Seiun Award in 2017.

Despite the title this manga has nothing to do with sex, just young people rebelling against the world.
The manga is about the adventures of a girl, Kaho. In the first chapter she goes on holiday to Okinawa and starts following around Yuki, a car-stealing punk.

From An Endless Story:
Popular stories from fashion magazine Zipper have made their way into a special book.

Letter by Hazuki Kanae
"Who are you?"
On a certain day, she discovered a letter left in her school desk...

My Best by Fujisue Sakura
"I can't touch him, because we are friends."
Where will these unsuppressable feelings lead us...

Miss You by Kumiko Saiki
And the day they part ways finally arrives...

Goodbye, I'll See You Tomorrow by Tomoko Noguchi
Yasaki, who finally gets a boyfriend, now has to enter into a long distance relationship! Even though she thought that the pain of not being able to see him was the same...

CHERRY by Matsumoto Nanako
The only person that would suit her is someone as extraordinarily popular as she is, right!? The person in question should definitely be...

To the You Who is Here by Haneda Ibuki
Does she still seem like a child to her older boyfriend?
All she wants is for him to glance her way...

Collection of Nishida Higashi's debut oneshots

Yuzuki has always had an unrequited love towards her childhood friend Junya, but one day Junya starts dating his classmate Kaori.

Yuzuki was shouldering the pain that she would never be able to express her feelings to Junya. A while back, she had noticed that Toshiki was looking at Kaori with such a sorrowful expression. In order to obtain the paradise that she desired for, she decided to become accomplices with Toshiki but…!?

Contains a short story named Hatsutaiken:

Araki is dating Arashi but she has a secret from her past that she doesn't want Arashi to know. Will she be able to keep it a secret?

Volume 8-9 is a special one, as it talks about Rapunzel's side story.
This is an additional volume called Koori no mamono no monogatari Gaiden, which is an anthology of short stories featuring different protagonists of Koori no Mamono no Monogatari,

Nomura Nobuo was a normal highschooler, until his "gift" convinced him of his separation from the masses. When his gift is unmasked by Kaburagi Jirou, it marks the start of a war. A war on society itself. The War Front: Spike Hills.

Fujinami Kou is a high-school second-year who had lost his boyfriend, an upperclassman schoolmate, to a car accident an year previously. On the anniversary of Misumi senpai's death, Kou is dispirited and contemplating skipping school. Kakitsubata Saki, a first-year, sees him and offers help, assuming that he's ill. As Kou startles at the sight of Saki's face and mentions that he resembles "the person I used to go out with", the younger boy is instantly intrigued and resolves to discover his sorrowful, introverted upperclassman's secret.

The demonic overlord has been revived, and kidnapped the beautiful Princess Sina. An army of the world's finest knights has been sent to his castle to rescue her, but Sina refuses to be a mere damsel in distress and decides to break free on her own.

Nanako Kobayashi, a 17-year-old teenager, has an ugly face who seems to not have a care for the world. One day, she got a call, only to be given two choices to answer a question. A devil suddenly appears, taking the form of her teddy bear. The devil is willing to grant her three wishes; each based on two options; What wishes will Nanako choose?

[From Ushi]:

"Once upon a time I dreamed I was a butterfly,
fluttering hither and thither,
to all intents and purposes a butterfly.
I was conscious only of following my fancies as a butterfly,
and was unconscious of my individuality as a man.
Suddenly I woke, and there I lay, myself again.
Now I do not know whether I was then a man dreaming I was a butterfly,
or whether I am now a butterfly dreaming I am a man."
-Chinese proverb from 3rd century B.C.
(Zhuang Zhou Meng Die (庄周梦蝶 ))

In the feudal era of Japan, Ogami Itto is the elite executioner for the Shogun until the ruthless Yagyu clan frames him in an attempt to gain the position. His name dishonored and his wife murdered, Itto and his infant son Daigoro wander Japan as an assassin for hire, named Lone Wolf and Cub. Ultimately, Ogami Itto strives for revenge against the Yagyu clan.

Since her dad's death since elementary school, Kamura has taken the role of being the responsible one in the family, including cooking, cleaning, and simply even getting her mom up for work, whom she promised to always protect. But then her mom tells her that she is getting remarried, and finds out about her soon-to-be 2 year older brother-in-law who she just saw homeless on the streets the day before! And now her friend Youhei, who always teases and makes her feel like a fool, is acting differently...and even tries to comfort her?! Will Kamura be to able accept her new family life with a father and brother, and be able to let go her feelings of being responsible for her mother?

Otaku and idol become seiyuu. Lessons at school, work, colleagues, and unexpected events ... Learn everything about the world through the eyes of a young seiyuu!

Hayama Makoto is tormented by sightings of shinigami*, Asano Mitsuki dwells on his dead sister's shadow, and Koumoto Yaeko longs for the love of her life―these are the heart-rending yet tender tales of the people whose thoughts dwell on life and death, and of the white Shinigami Momo.

*Shinigami (死神) is a figure in Japanese culture responsible for collecting the souls of the dead, and literally translates to "god of death."

The Soichi Front
The story is a direct continuation of "Secret of the Haunted Mansion" from the first Yami no Koe.

Soichi's Beloved Pet
This story is about Soichi, the devilish boy that Ito has written about in a number of his other stories, and the events that unfold when his family adopts an abandoned cat.

In The Valley of Mirrors
There is bitter enmity between two villages, facing each other across a river. But instead of erecting walls and battlements, they both decided to put up mirrors. What could this mean? And where did all the people disappear to, all those years ago?

Anything but a Ghost
While driving on a mountain road one night, Shigeru finds a girl covered in blood.

Library of Illusions
Koko lives with her husband Goro in a giant mansion full of books. The books are a family heirloom, and he’s fiercely protective of them, so it would really suck if something were to happen to them...

Songs in the Dark
Ever had a song stuck in your head? Of course you have, there’s probably one there now. But what if it didn’t go away? Days, weeks, months, the same song 24/7.

Splatter Film
A bunch of stoned slackers get hooked on delicious honey, with delicious results.

While Professor Saotome completes his masterpiece, the Shin Getter Robo, a strange object enters the Earth's atmosphere. Hayato, in control of the lab while Saotome obsessively works, orders Getter Robo and Getter Robo G to launch and destroy the object before it impacts.

A mysterious man of outstanding beauty appeared before me... just as I lost my father to the hands of death. Although I thought he was a debt collector, I was surprised when I found out he was actually my possible foster father. Before I knew it I already fell for him - Sena-san. One touch from this man makes my heart race! Also, what is the meaning of that sudden kiss?!

In the Shibuyaku Maruyamachou series:

Volume 1 - Shibuyaku Maruyamachou

- Shibuya District, Maruyama Neighborhood: After School
Itoi is being picked on by her classmates, but doesn't want to admit it to herself. She becomes closer to Ariyoshi when they are paired together to make costumes for a party and Ariyoshi takes her shopping in Shibuya. Will Ariyoshi be able to help her admit what's going on and come to terms with it? And is there something more between them than just friendship? A two-part story in a compilation volume by Okazaki Mari in which all the stories feature the Shibuya district.
- Lililicious

Volume 2 - Sakura

Volume 3 - Rounin Gorou

Volume 4 - Hyakka Ryouran

- Wasurena Kusa
- Adabana
- Matsuri Ichiya

From justpeachyicedtea:

Adults have secrets. One night, after hearing a scream, Takimoto Kaoru is suddenly held tightly by someone in complete darkness. He was too surprised to retaliate, but the smell that tickled his nose was… Sakumra-kachou?! In addition he tells him to “sleep with me tonight”?! Takimoto, who couldn’t refuse an elite superior is now being used all over the place! And the appearance of a troublesome yandere ikemen Iwase Yuutarou doesn’t help either. A bitter love, where the guys’ wounds and secrets overlap, is here.

When researching an ancient sunken ship in the Arabian Sea, Belle is kidnapped by rebels and confined on a small, deserted island! One stormy night, she is rescued by Rafiq, a strong man, who turns out to be the prince of the kingdom of Q'aroum. But Belle is once again locked up-this time in his palace. To her astonishment, Rafiq even demands that she marry him within one week! What's his purpose? The young prince Rafiq has a secret reason for keeping Belle in his palace...