Manga adaptation of the anime series.
Green Leaves Entertainment is a tiny production company on the verge of going out of business in Sendai, the biggest city in Japan's northeastern Tohoku region. The agency once managed the careers of magicians, photo idols, fortune-tellers, and other entertainers, but its last remaining client finally quit. In danger of having zero talent (literally), the president Tange hatches an idea of producing an idol group. On the brash president's orders, the dissatisfied manager Matsuda heads out to scout raw talent. Matsuda makes a fateful encounter with a certain girl...

Some time before the June of summer. One day, she suddenly died...

"I" and the corpse of the girl who should have died, "Makoto", spent those false summer days in that apartment.

The relationship between these two sad, distorted people slowly becomes clearer...

The office of the Time Eliminator offers a unique service, the ability to eliminate an event that happened in the past. Rex, the man with the power to travel through time, may look young, but he's a professional. He goes back in time well-prepared, with various gadgets and even an earpiece for communication with his support in the present. While Rex typically takes on cases for profit, he's also particularly looking for ones that might give him a chance to obtain a magical "Babylon Item". The first case of the series is from the last remaining descendant of Fred Abberline, who was one of the detectives who failed to solve the notorious Jack the Ripper murders. Ever since then, the Abberline family has been cursed. Could the curse be the sign of someone in the past using a Babylon Item?! It's up to Rex to go back in time to the Jack the Ripper incidents and find a way to remove the curse from the Abberline family!

From Anime News Network:
The story begins in the distant future in the far reaches of the galaxy. The Human Galactic Alliance has been constantly fighting for its survival against a grotesque race of beings called "Hidiaazu." During an intense battle, the young lieutenant Ledo and his humanoid mobile weapon Chamber are swallowed up into a distortion of time and space.
Waking from his artificially induced hibernation, Ledo realizes that he has arrived on Earth, the planet on the lost frontier. On this planet that was completely flooded by the seas, people live in fleets of giant ships, salvaging relics from the seas' depths in order to survive. Ledo arrives on one of the fleets called Gargantia. With no knowledge of the planet's history or culture, he is forced to live alongside Amy, a 15-year-old girl who serves as a messenger aboard the Gargantia fleet. To Ledo, who has lived a life where he knows nothing but fighting, these days of peace continue to surprise him.

The story revolves around a high school student named Shinya Matsumoto and his love story, which takes place in the summer vacation. Shinya unexpectedly encounters a car accident, which results in a mother and son being taken to a hospital. The son, Daisuke Kirishima, is completely fine while his mother, Reiko Kirishima must stay in the hospital for three weeks and is unable to look after her son thereafter.

A tale of a dragon rider.

Hito Natsu no Kids Game (ひと夏のKIDSゲーム Hito Natsu no KIDS Gēmu) is a short, debut manga work by Ken Akamatsu, the creator of Love Hina. The manga was published on September issue of Kodansha’s Magazine Fresh on September 10, 1993. Ken Akamatsu later received Kodansha’s "Freshman Manga Award" (Japanese: 新人漫画賞/少年マガジン新人賞) and Special Jury Award (Japanese: 審査員特別賞) for this work.The manga was re-published on 20 May 2001.

(Description taken from Wikipedia)

From Kodansha:

After a battle with an evil demon, an entire village is laid waste. All perish, except for one boy. Keeping his master's teachings close to his heart, this lone survivor sets out on a journey westwards in search of new sights and unimaginable power. The boy's name: Gray Fullbuster. For the first time, experience Gray's childhood adventures, and follow him down the path that will lead him to Fairy Tail!

Details the meeting of the founders of Fairy Tail and exactly what happened between them to lead them to found the guild. Told primarily from Mavis' perspective.

Mamoru is a Nishiarai game player who has switched to a first-class powerful new high school named Hijiri Gakuen Koukou. There he met with a group of eccentric game lovers who call themselves Dennou Kenkyubu, he accidentally joined and had to undergo a variety of events and adventures with them.

The story starts with the death of Hikaru Mikado. That guy was a natural charmer, a “harem king”, but had no real male friends. After he died, he became a ghost, a soul, but Koremitsu Akagi can see him. Koremitsu though, isn’t really like Hikaru. His red hair and his evil-looking eyes make him look as a delinquent, even though he is very kind inside. Hikaru asks him a favour: he wants to fulfill a promise, which he couldn't fulfill anymore. The promise was to give his girlfriend and fiancée, Aoi Saotome, seven gifts for her seventeenth birthday. Koremitsu accepts, and has to work hard to help fulfill Hikaru’s promise with Aoi.

Spin off of Hitsugi no Chaika. Takes place in high school.

It's the typical setting of a J-RPG. be a hero, find companion, defeat demon king, go home, have a party. The end, good ending, roll the credits. But that's not all...

What if i told you, that after all that credit scene, and all the character just froze up as the "game over" sign comes up, there's a character who suddenly regain his consciousness?

What if that there's not just one, but the entire hero's party suddenly regain consciousness while the other NPC just stood there like a display ragdoll?

What if i told you, that this whole hero defeats maou fiasco are but a plan devised by the great demon king himself to teach those hero about despair?

This is a story about a heroic companion who is loyal to their friend
This is a story about a heroic party who was cursed by the so called demon king.
This is a story about despair
Tthis, is the aftermath of the Final Quest
This, is the Final re:Quest

Li Xao Yao left S.W.A.T to become an ordinary security guard, while working, he happened to enter the VIP room and found Lin Wan Er still in the middle of changing, as revenge, she took him on a ride and kicked him out of the car. After hours of walking, Li Xao Yao finally managed to get back home just to be kicked out of the house. He then got an offer from his previous supervisor to become the bodyguard of the Tian Xi group ceo's daughter both in game and in reality. But unknown to Li Xao Yao the girl was actually...

Due to the friendship he had with Ted, McDohl's attempt to save him eventually turned his life around from being the son of General Teo McDohl of the Imperial Army to become a wanted enemy of the Empire. A chosen bearer of one of the 27 True Runes, his encounters with death were already foreboding the moment the True Rune was attached to his right hand. Yet, McDohl continues to walk upon the journey through the Empire: facing corruption, cruelty and the life-changing decisions he has to make in order to restore order and peace for the people in his country and to fulfill the hope of many that was entrusted to him. Based on the PSOne video game, it is also loosely based on the Water Margin classics, though it's limited only to the gathering of 108 Stars of Destiny in order to overthrow a corrupt government.

"Once upon a time, this world was ruled by beasts. Humanity no longer sat atop the foodchain, they are the monsters' prey. However, those who would stand up against the monsters gathered together and they continued to battle against the monsters in order to survive against their rule. Since then, hundreds of years have passed... and now the "fight" against the monsters has become the "hunt" for the monsters."

The series was also released on MangaONE app.

Kabukicho, Shinjuku – the district that burns with desire is struck by an incurable disease.

In this district, a doctor, Inui Date, runs a small medical clinic Night after night, patients with extraordinary cases come to the clinic. Things change when one day detective Maria Daigo, a troublesome patient, appears.

Set in a Shinjuku that has been plagued by an incurable disease, the doctor and the detective become entangled in one mysterious case after another as they face the darkness in this psychological thriller.
Will the two be able to save this town?

Shirahama Kenichi is a book lover who has just entered high school, but he is often bullied by others. One day, he became good friends with the new transfer student, Fuurinji Miu, who was also looking for a friend. Kenichi was shocked at how powerful she is at first, but he is still somehow attracted to her...