<Cheating Men Must Die> Side Story. The beginning of intern Su Lüxia journey of abusing scum.

π is an innocently positive older sister who loves to hum rap tunes and Makki is an introverted and perpetually book-reading younger brother. They possess eternal life and spend their never-ending days on a planet where all mankind has been wiped out long ago. Using a simple yet impactful drawing style, the author portrays the everyday life of these immortal siblings and their impossible journey of exploration of what it means to live.

“The “Footstamp operation” … … what the hell really happened there!?”
Okinawa, summer of 2112 before Tsunemori Akane is assigned to Division 1 of the Public Safety Bureau Criminal Investigation Department.
Sugou Teppei, belonging to the 15th unit of the joint task force of the National Defense Forces, is taking part to a military operation as an excellent pilot.
Three months later, a case where an unmanned armed drone attacks Tokyo and the Ministry of Defense begins.
In order to investigate the case, Masaoka Tomomi, enforcer at the Criminal Investigation Department’s Division 1 who went to the National Defense military base, comes near the truth behind the case with Sugou.

It's been 18 years since Rin died. Alisa, who is Sei and Lou May's daughter, lives with her mother, her brother Shinji, and Ken in Hawaii. Shinji is Ken and Lou May's son. Shinji knows Alisa isn't Ken's real daughter, but Alisa doesn't. Alisa sometimes sees a phantom boy. One day, she sees a boy point to the sky, where she sees a plane. By the plane, Rie, Shin's son, comes to ask Ken for some help. He also knows Alisa is really Sei's daughter. Alisa is called "Dragon's daughter." Rie says a prophet told him that he would marry a woman who's a dragon's blood relative. When they go into the forest, Rie also sees a boy. Alisa tells him that the boy is a phantom and that he is the only other person who can see him. Her family had told her that the boy was the spirit of the forest, but she doubted that. She thinks the boy is trying to tell her something.

This world somehow changed and isn't normal anymore... There's no boys to be found, and all the girls have become...

Super Dragon Ball Heroes: Dark Demon Realm Mission! is a spin-off manga.
It tells the story of the conflict between the Time Patrol and the Dark Empire.

A seinen take on Saito's classic Survival. It tells about the drama of those who survived the fall of a meteorite on the Pacific Ocean after a failed attempt of destroying it with a missile. Cities are destroyed by big earthquakes, food runs short, illness spread quickly. In the midst of this scenario, Ootomo, the main character of this series, will do whatever in order to survive.

what happens when gamers are summoned back to the real world in their game avatars

Its been 15 years after the last Great War. While the scars of wars appear to have vanished on the outside.In truth, the world has become a much harsher place.Follow the journey of Felix and Bay on their quest to find someone from their past.

In the Steins;Gate - Hiyoku Renri no Sweets Honey series:

V.1 - Hiyoku Renri no Sweets Honey

V.2 - Motto Hiyoku Renri no Sweets Honey

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• Hiyoku Renri no Sweets Honey Final

Newly-transferred girl, Oribe, falls in love with the most popular and charismatic boy of the school, Sagara. But, Oribe is not what she seems? The tale of the mecha girl with the heart of a maiden unfolds!

Ex-licenced by Dark Horse Comics.

A decaying, old satellite is headed straight for Tokyo, and the city is three citizens shy of total evacuation. Hard-boiled detective Watanabe remains in the abandoned gotham, searching for a gaunt, desperate Machida, who is wanted for attempted murder; and Chiaki, a stubborn housewife who doesn't believe the burning rubble will hit Tokyo, also remains behind. But Chiaki is wrong. And when the satellite does hit, the three find the city is less abandoned than before. Someone was riding that satellite down from orbit, and that someone wasn't born on earth!

Trigger Keeper (トリガーキーパー, Torigā kīpā) is a two-part one-shot created by Daisuke Ashihara. It is the first precursor to the World Trigger manga series.
(from the World Trigger wiki)

17 year-old Qi was diagnosed with an incurable disease at a young age. Doctors warned that she would probably die by the age of 20; however, Qi's genius with robotics allowed her to create robots to act and hands and legs for her when her body became too weak. Yet despite all her genius with robotics, Qi's dream to replace her dying body with an entirely robotic one seems an impossible one. However, just as Qi's body seems finally ready to give out and she is on the verge of death, something unexpected occurs...

Never far from the future. In this world, all children are gathered up onto an island known as the "Juvenile Circle". They receive their education there until the age of 18, when they graduate and go into society as adults. A boy named "Shizu" was overcome with strange feelings of anxiety the day after his graduation. Were they directed towards becoming an adult? Does he want to remain a child? It was neither of these. Anxiety embraced Shizu. The anxiety would lead him towards the "truth" of his world.

It centers on a girl named Wakaba Himekawa, who is aware that she is growing up slower than other people, but otherwise lives a peaceful life. On the same day that she finally gets her first period, her childhood friend Takaya confesses that he loves her. While Wakaba had never felt that way for her friend before, she is still happy, if confused. As she is about to answer Takaya's confession, an alarm suddenly sounds, and a broadcast begins that will change her everyday life.

The series stars Azuma and Metabee as their friendship is put to the test when a meteorite collides into their town.

After the end, a young girl and her overprotective giant robot father figure travel the world salvaging supplies and avoiding the threats of the wasteland.
A roadtrip-style story about these two characters, the eager scavenger and her clumsy- but loving- mecha pal.

From MangaHelpers: Luca's friend Will, who is from a lower-class segment of society, has gone missing. Luca's only clue to find his friend is his fondness for a certain club in the entertainment district, where a woman named Yue performs. Will had always said they should go there together sometime. When Luca goes down alone to try to speak to Yue, though, he ends up being beaten badly. Luckily, Yue herself finds him, and takes him to her friend Takaomi to be patched up. It soon becomes clear that Will has fallen victim to a chimera sickness that is becoming common in the lower classes. Luca is determined to find his friend, and to save him. [tethysdust]