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...

On his way home from school, the shy young boy Tecchin finds the body of a young girl lying in the street. He alerts the police, only to come back to find she has been replaced with a life-sized doll. Tecchin takes the doll home and repairs it. She comes to life and tells him that they are both Grand Dolls, alien beings bent on world domination.

Flight Highschool is a series of webcomics created by Anyan. It features anthropomorphized modern military aircraft living daily lives in high school.

Original naver page: http://blog.naver.com/jk100687

We all wish we could go back in time, to turn back the clock and fix the past. But in this reality, that simple wish brings about something deadly—demons that devour a person's time! It’s up to a group of strong warriors who fight using time manipulation to destroy these blights. Brought together under unique circumstances, Victor, Kiri, Mina, and Blaze have what it takes to maintain the balance of time as the chosen fighters—the Chronos Rulers.

Note: This is a Taiwanese manhua that Shueisha is publishing for free on its Shounen Jump+ website and app.

Yanahara Taichi joined the Acting Club for the first time, but the only problem is that he gets too embarrassed to do anything! As the 3 girls in the Acting Club help him with his troubles, Yanahara eventually gains the courage to do something outrageous, but it only stirs up trouble!

Possessing both flexibility and tenacity, Imomushi (Japanese for Caterpillar) is an assassin that does not kill anyone but those who are assigned to her. She seems to have had something happen between her and her older sister in the past, however.
A new spin-off story from the same author of Arachnid, this story looks at the inner workings of a top assassin within The Organization itself.

Note: In early 2014, serialization resumed with a new artist. The series had been on hiatus after the sudden passing of the previous artist in 2013.

A boy from the future meets a girl from the present. Together they are destined to save the world.

Spinoff of Assassination Classroom serialized in Saikyou Jump

In the Viking Brides series:

1-Byakuya no Princess (The Reluctant Princess)
Elli has no memories of her homeland or father, having been raised abroad by her mother with her sisters. When a mysterious man breaks into her house, she finds out that she’s royalty of the far-off land of Gullandria, and that her father is the king! With a reunion in the cards, will Gullandria prove to be all Elli hopes, or will she escape into the arms of the man who brought her there?

2-Gekka no Ayamachi (Prince and Future...Dad?)
Princess Liv Thorson honestly believed she could skulk back to America, her uncharacteristic night of passion a secret known only to a sympathetic sister...and the Viking prince who possessed her underlisse. Then came the baby trifecta--woozy tummy, fainting spell, rash--telltale signs that she and Finn Danelaw had made a lot more than love....
Finn Danelaw was used to hearing all kinds of utterances from women, but "no" wasn't usually among them. He had, however, a proposal for beautiful Princess Liv...and though he'd planned a seduction along with it, he'd learned a long time ago that all good things come to those who wait. For the test results, that is. The pregnancy test...

3-Shukumei no Deai (The Marriage Medallion)
He’s going to be my husband? Princess Brit is forced to marry to preserve the royal bloodline, so she flees the palace and heads for the distant North Sea. But on the way there, her plane crashes, and she is thrown against the steep cliffs. She’s hurt and terrified! As if in answer to her pleas for help, a dark shadow appears. Is he the legendary black knight? No—it’s Eric Greyfell. He’s as beautiful as a hero from Norse myth, but his heart is as impenetrable as a stone statue. And he’s the man she was expected to marry!

4-Kamen no Prince (The Man Behind the Mask)
Dulcie has arrived at a foreign palace to celebrate the wedding of her best friend, the princess of a small country. There, she meets Prince Valbrand, a man with a scar on his face. A hideous burn scar, marring the face of a beautiful man. What cruel fate must he have endured? On the night of the ball, spurred by curiosity, Dulcie dances with him and realizes that she has fallen in love.But as Dulcie grapples with her emotions, a tragedy awaits.

Marimo Himenogi desperately wants to become an idol singer. When a local contest is announced, she begs her boyfriend, Ayumi to sing as her partner. Ayumi relents, and disguises himself as a girl so that he and Marimo can enter the singing competition. Surprisingly, they win and are signed to a recording contract as a new group called "Twinkle". Now they must keep their newfound fans from finding out that Ayumi is actually a boy.

The story is set in a world where supernatural powers exist through science, and magic exists through religion.

"Academy City." 2.3 million inhabitants.
80% of the students are active in the "Brain Development Program" and out of those only 7 are Level 5s.

Meet the civilian protagonist Mikoto and her friend Kuroko, maintainers of peace and order at the University district, as members of the 'Judgment'.

Eve was spoken to by a gorgeous, sexy guy at a party for celebrities. It was Luca Cardelli. “He hasn’t changed a bit…” Eve met him once ten years ago, but it seems as if he doesn't recall it. No wonder. He just gave a dream ticket to Eve, who was an unpolished teenager back then. But after they meet a second time, Luca is more determined than ever to have her. Even though she is now a TV broadcaster, she still doesn't fit into his upper-class world…!

In a land where no magic is present. A land where the strong make the rules and the weak have to obey. A land filled with alluring treasures and beauty yet also filled with unforeseen danger.
Xiao Yan, who has shown talents none had seen in decades, suddenly three years ago lost everything, his powers, his reputation, and his promise to his mother. What sorcery has caused him to lose all of his powers? And why has his fiancee suddenly shown up?

From Senpai Scans:

Himesato Ui has just enrolled in her late mother's old high school, Shinomiya Academy, as a first year! Hatsu's mother was known as "Prima", the most beautiful girl, in the Academy. Ui was full of hope and expectations in enrolling in the Academy, but she was puzzled by the Academy's system of evaluation for students was by a point system. Furthermore, in the school, she met an unknown pretty boy?!

Once upon a time there was a wonderful prince… A super rich and handsome prince with a genius IQ of 500, extraordinary physical prowess… An outrageously overpowered super star…!! What will happen when this ridiculously overpowered ultra-high spec boy and a certain ultra-level-headed ordinary girl meet…?!

The Katvarna Empire is at war with the neighboring Republic of Kioka. In the Katvarna Empire, the lazy, woman-admiring Ikuta hates war, but due to certain circumstances, he grudgingly takes the High Grade Military Officer Exam. No one would have expected that this 17-year-old young man would eventually become a soldier called a great commander by others. Ikuta survives this world engulfed in war with his superior intellect.

Follow Ryuu as he plays mahjong with gangsters, crooks, and all sorts of dangerous people.

Watase Marin has a special ability- she is able to see ghosts. However, there's a catch. Ghosts are able to take over her body if she makes eye contact with them! What happens when a cute girl ghost decides to stir up some trouble and make her confess, then kiss Horin-kun, a guy in her class that she likes?

In the manga's story, the everyday lives of the nine super-powered siblings of the royal family are monitored by more than 200 surveillance cameras and broadcast nationwide. The people of the nation who are watching the broadcast will have the ability to elect the next monarch. The story focuses on Akane, the third-oldest sister who can manipulate gravity. She is shy and desperately does not want to be caught on camera.

From sensualaoi:
A 30-year-old business man makes a wish to be a girl. A chanting object runs toward him, and the next thing he knows he has became a loli elementary school girl.