The girl I fell in love with is… an alien!? I, the class president, happened to fall in love with my classmate, the eccentric Haru. I confessed my feelings, but her true identity was an extraterrestrial who came to Earth to survey it. “I still like you!” I started going out with Haru, but I have a further “secret” to keep…

Azumi focuses upon the life of the titular young female assassin. The manga begins an indeterminate number of years after the Battle of Sekigahara.
As Azumi begins her duty, the manga introduces its characters into mainstream history. Many of the early missions that Azumi undertakes are the assassinations of the prominent supporters and generals of the Toyotomi Clan, against whom Tokugawa Ieyasu expected to again go to war. The manga 'reveals' that many of the Toyotomi leaders who conveniently died of diseases or accidents prior to the final confrontation between the Toyotomi and Tokugawa were actually victims of assassinations by Azumi and her comrades, thus indicating to the reader when the events were taking place.

Note: Won an Excellence Prize at the 1997 Japan Media Arts Festival and the Shogakukan Manga Award in 1998.

The greatest warrior of the Boulder Axe Tribe, Urich.
He accomplished what others in his tribe could not, and went beyond the ‘Sky Mountain Range’.

What he saw beyond the mountains was,

Different clothing being worn, different languages being spoken,
and unfamiliar people in iron-clad armor.

“So, the realm past the mountains wasn’t just a spirit world for the dead!”

An uncharted world, and the one who faces it,

Barbarian Urich is headed towards the civilized world!

On her 12th birthday, Angele is infected with the strange and fatal disease that causes feathers to sprout from the body. She is sent to a solitary institution to be quarantined where she meets a man named Hakana and the wheels of fate begin to turn. (Source: Mangaupdates)
Based on the free game from Niconico.
Play the game in Japanese: https://game.nicovideo.jp/atsumaru/games/gm4581
Watch a playthrough with everything narrated: https://www.youtube.com/watch?v=wFmcgB3bikM

In the 13th century, the Mongolian Empire rapidly expands across the globe. Later historians who studied the prophecies of Nostradamus would say that Mongolia was the birthplace of the "Great King of Terror," Angolmois. And at last, the force of the Mongolian Empire would turn their attention toward Japan... 1274: The Bun'ei Invasion. The exiled samurai Jinzaburo Kuchii is in Kamakura when he finds himself face to face with this invasion.

This story is a fresh look at the great battle that rocked all of medieval Japan: the Mongol Invasion. It shows how the people of Tsushima panicked, struggled, and eventually rose up against the overwhelming forces of their enemy.

The story of a middle school girl trying to find herself in the confusion of adolescence.
Skateboard-loving Ichiri Sanjou, nicknamed "Icchi," may look like a normal energetic kid, but whenever she sees the full moon, she is hit with a wave of emotion she cannot comprehend.
The series revolves around her learning the Afro-Brazilian martial art of Capoeira.

The protagonist, Masaru, has just inherited a big fortune after the death of his father. However, people are trying to get their hands on it by any means necessary, even if it means killing him. Narumi helped Masaru from being kidnapped after fighting some weird guys. He found out that they're not humans but wooden puppets with amazing strength. After a hard fight, Narumi was forced to admit that he's no opponent for them; and just when he started to think that Masaru would be captured, Shirogane, Masaru's watcher arrives from France with a weapon, the puppet Arlequin. Here, begins the story of Karakuri Circus.

An adolescent ghost story that invites college student's "desire". Drinking parties, looking for clubs, romance... Chigarashi Mahina, a freshman who is busy with her flowery college life, is haunted one night by ghosts after entering an abandoned building. Nights after nights, she had nightmares of her getting raped. She then seeks help from a specialist on campus, Makube Kaoru. That was the beginning of a college life filled with desire and fear...

The brave tale of the peerless Great Emperor Leonard the First was evaluated as a universal truth.
However, in his younger days, before he managed to unify the continent, he was a boorish and clumsy young man, he got his homeland taken away from him and was branded with the infamous name of “Nosferatu”. This is the story of a great counterattack, a great revolt.

Leonard vowed to recover his homeland and truly became a mighty warrior. Several great generals, sages, talented women and geniuses comparable to gods and demons got attracted to the single-minded Leonard and congregated around him. Eventually, they became a great force able to engulf their depraved fatherland and contended against rival countries.

The story centres on the oddities that appear in the distortions within everyday life.

What destiny awaits them after the screaming?

After abruptly departing from a train in a small town, a couple encounters a “weeping woman”—a professional mourner—sobbing inconsolably at a funeral. Mako changes afterward—she can’t stop crying! In another tale, having decided to die together, a couple enters Aokigahara, the infamous suicide forest. What is the shocking otherworldly torrent that they discover there?

One of horror’s greatest talents, Junji Ito beckons readers to join him in an experience of ultimate terror with four transcendently terrifying tales.

Souya is a sullen salaryman whose days are spent chasing after work deadlines all while still keeping his dream of becoming a manga artist. To him, his one and only support in life is none other than his beloved wife, Yuuka. One day, on his way back home, he was suddenly caught in an accident and before he knew it, an alien had taken hold of his body! Not only that, the evil threat of another alien is closing in on Yuuka too!

Here comes Souya as "Otto-man", his superpowered husband form, as he jumps in to save his dearest wife! Have a taste of his love for wife and this world!

Takashi Suzuki is a young man who dreams of a heartwarming slow life in some other world. When he finally gets reincarnated into a different world, he receives the "unconditional love from all local species" cheat ability, thinking it will allow him to raise cute animals... But the world ends up being a horrible "anything-goes" apocalyptic wasteland reeking of blood, filled with executions, torture, looting, and ruled by the most cruel and brutal demons imaginable?! His only weapon is ultimate, unrivaled cuteness... So he decides to use that to butter the demons up and transform this blood and violence-filled world!

Our protagonist is a college student who enjoys playing as the evil-aligned faction Arachnea in her favorite real-time strategy game. One day, she finds herself in a world similar to the one in the game; additionally, her body is now that of a fourteen-year-old girl. While things are a bit different from how they were in the game, one element has remained the same: she is the leader of the Arachnea. The insects under her control, collectively known as the Swarm, praise her and implore her to lead them to victory. In order to survive, she raises her Swarm and forms friendly relations with the elves of the neighboring forest. But after a slaver traveling through the forest murders one of her Swarm and the nearby kingdom's knights burn down the elven village and massacre its people, she prepares to launch her counterattacks in the name of revenge. However, revenge is merely a pretense for attacking the countries of this world. Her command is masterful and severe, as one who has played the game in real life... (Source: J-Novel Club)

Official English Translation of Novel: https://j-novel.club/v/her-majesty-s-swarm-volume-1/

A story about a criminal who was sentenced to “Eternal Punishment”. The main character, Touma Kuga, was aiming to take medical school entrance exams, having heard that his classmate, Satou Rin, whom he is in love with, said that if she were to marry someone, it would be a doctor. By chance, Kuga is able to go on a date with Satou, touring universities, but the two get involved in a certain incident…

When he woke up, Souma Tetsujirou, a samurai from Kamakura who had survived the Mongolian invasion, found himself in an unfamiliar place.

He was told by Hrist, the girl who brought him there, that they were in Valhalla, a place where the souls of dead warriors congregate. In order for him to be revived, Tetsujirou now has no choice but to fight against the "dead warriors" from different eras in this mythical place of carnage that he's been thrown into.

This is the start of a samurai drama where one has to fight and strike down their enemies, even if it kills them!!

Jyashin-chan Dropkick is a violent slapstick comedy about a delusional gothic lolita, Yurine, who summons a demon girl with the tail of a cobra, Jyashin-chan.

They'll have to live together -- until Yurine finds a way to send Jyashin-chan back to hell, or until Jyashin-chan kills Yurine.

Chaerin leads a blissful and comfortable life as the lead in a romance novel. She only has eyes for the male lead, Jeha, to the point where all the extras are literal black shadows.

But then, one day, her story suddenly switches genres.

All of a sudden, she discovers that if she wants to live, she has to band together with the extras she ignored before and work with them to survive!

From the author of comes this genre-defying tale!

On that day, humanity was turned into “prey”―.
Gen is a high school student living on the island of Tsushima, a door to mainland Japan.
Along with his sickly sister, Misaki, and his heartwarming mother, Gen was living a peaceful life, all until an “asymmetrical monster” appears on the island.

All hell breaks loose on the island of Tsushima.

These monsters devour everything from plants to animals, to humans, and mutate together.
Will humanity stand a chance against these mutant creatures?
Is there any hope?

Kenichi Tachibana from Terra Formars illustrates yet another crazy Sci-Fi survival series!!!

From Anime News Network:

Tatsumi Karasawa becomes the owner of host club "Shinijuku Sokai" in only two days. He leads a group of amateurs who aren't afraid of gangsters, police, or so-called "professional" organizations. Without fear, he walks the difficult path leading straight to the top.

The inside of the taboo door is shattered, or...