Mysterious alien life-forms invade Earth! Most of humanity is wiped off the face of the planet. John, his sister, and the remaining survivors hope to find a new world to inhabit... But one day, they're targeted by aliens again! (MANGA Plus)

From PRISMS:
Wahhaman is a special robot soldier built ten thousand years ago by the Atlanteans. Found and dug up in present-day Toukyou, he doesn't remember anything, due to a nasty knock to the head he received at some point.

More than ten years ago, the "aberrant beings" suddenly appeared all over the world. With forms similar to creatures from various legends and mythologies, these "aberrant beings" led countries to gather their best specialists to confront them... People called them "exorcists."

A young man named Tojuro, who works as an exorcist due to his family's circumstances, dreams of living an ordinary life. However, during one of his missions, he encounters Behemoth, a legendary sacred beast mentioned in ancient legends. But, despite being an "aberrant being," Behemoth does not have the appearance of a monstrous beast; instead, she takes the form of a beautiful woman.

They embark on a pilgrimage to Antarctica to discover their true identities. Who are we, and where are we going?

In Confucian Era 14276, a violent showdown unfolds in the space surrounding Planet Lagra. And with that, the story begins. Unfolding on Earth and in far-off galaxies, in the past, the future, and across dimensions, the curtain has risen on the final war between light and darkness. A great, galactic epic spanning the author’s career begins here!

Kyomu Senki is made up mainly of four series: “The Tiger of 5000 Light Years” serialized in 1980-82. “Kyomu Senshi Miroku” and “Jaki-oh Bakuretsu”, both of which started serialization in 1987, just a few months apart. Lastly, “Skull Killer Jaki-oh”, a mech series set in the 20th century that originally started in 1990.

Along with the four main series, it also includes four short stories: “New Rashoumon”, “Ninja Arts at Honnou Temple: The Black Magic of Koji Kashin”, “The Strange Living Dimension, Dogura”, and “The Dogura War Chronicles”.

A gate to another dimension has burst open, and from it emerge gigantic, invincible creatures that threaten all of humanity. Earth's only defense is a mysterious group of warriors who have co-opted the alien technology in order to fight back!

A world where human trustworthiness is ranked.

Kiriya, a boy who has had everything taken from him by the rulers, throws himself into a rebellion that will turn the world upside down—

A forbidden sci-fi suspense story begins here.

Due to the Gear Expansion, witches who had been friends with the people become unnecessary. Humans, who were afraid of unscientific powers, begin a witch hunt… And a human boy who has his beloved witch killed becomes the “Wizard of vengeance”.

Okinawa. An ordinary senior high school student, Kio, meets an alien girl who has cat ears and a tail who came to Earth so that she could learn more about it. In the end, he decides to bring her home. However, living with such a person might not be as easy as it seems for Kio!

Gorou Saruwatari and Lostman are mountain climbers who have ascended some of the highest mountains around the world. At the peak of Mount Everest, they see the ISA Space Station in the sky above and become determined to go into space. At the same time, NASA begins a program to research and obtain a new energy source which has been discovered on the moon. Gorou and Lostman attempt to join the program through different approaches: Lostman becomes a pilot and Gorou takes a job as a construction worker.

Yaguchi, who got on board the ship as a cargo ship temporary worker to repay debts. But that was the beginning of a spectacular human experiment. Suddenly, the ship shook greatly and the scene in front of it began to distort with a fierce headache. Before the request to move to grasp the situation, a disastrous scene unimaginable has spread …. Astonishing national overturn suspense where the world's largest urban legend "Philadelphia Project" and the modern world are intertwined!

An Eldritch being disguises itself as a convenience store worker to understand the meaning of life.

All of his classmates, including his best friend and his crush, have been reduced to nothing more than brains. An alien who calls herself A-sensei informs the protagonist, Satoki Tsutsuno, that to protect the earth, they must use their collective brains. With Tsutsuno being the only one left in his class, what trials await him and his classmates...?

In a world where humanity has declined, Chico travels with her brother Pinot.

Gunji Akira, who has just started high school, has been chasing after his father's ghost by trying to become a police officer just like him. One day however, he has a surprise encounter with an alien while leaving school. And there begins the start of his fateful adventures with extraterrestrial life...

Note: It runs in a seinen magazine and will not be BL. At most, just as Fujobait as any shounen sports manga.

The story is set in the modern world, but there exist doors that can take people to the "other side," where strange urban legends and internet stories prove to be true. College student Sorawo Kamikoshi finds herself exploring one of these doors, and almost dies on the other side, when she is rescued by another girl named Toriko Nishina. Toriko is mysterious girl, but very skilled with a gun, and she seems to be searching for someone else on the other side. Together, both girls start to explore these doors to the other side.

The wacky adventures of Fran, Veronica and the other strange creatures continue.

More experiments, more medical miracles and more wondrous surprises.

At the risk of his own life, a young man sets foot in the ruins of a devastated old world. His name is Akira, and in order to claw his way out of the hellhole that is his birthplace of Slumtown, the boy became a hunter. In the wastelands he happens upon a strange woman, standing perfectly still, stark naked.
She is beautiful, but it seems that only he can see her. She exists incorporeal, tantalizingly beyond any touch, and she tells him her name is Alpha.
Alpha won’t show even a sliver of her real intentions, but with a wide smile, she brings Akira his first commission as a hunter. Akira takes the task, if only to become a stronger hunter, and having entered a contract, their dramatic lives in the hunting profession was set to begin.

From Stories of the Boy Hunter as recorded by the Eastern Hunters’ association.
Written post-collapse of scientific civilization.

In a world where heroes fight against evil from space sometimes they get hurt... and in comes a man with special powers... a massage that heals.

Follows the life of a hero who manages to win all battles with only one punch. This ability seems to frustrate him as he no longer feels the thrill and adrenaline of fighting a tough battle, which leads to him questioning his past desire of being strong.