Natsume Kanade wakes up with a terrible headache from the day before unable to remember who he is. Being confronted by a strange man with dark-rimmed glasses who calls himself "God" and being told that he is a high school teacher doesn't help. Stranger yet, everyone seems to know what happened yesterday - everyone except him.

Adaptation from the Yume Nikki RPGMaker game by Kikiyama.

Madotsuki is a girl who always dreams of the same landscape. One day, she decides to start exploring her dreams, searching for answers. There are some doors in her dreams. When she opens them, she finds all kinds of things...

Yasuoka Shion lost her parents, and her voice, when she was young...in a murder.

She was found amidst a blood-soaked room, and the only hint for the suspect was a Shougi board and one piece: the King. Now, Shion steps into the world of female professional Shougi players. As her popularity and fame slowly rises, so do the questions about her past, particularly the murder case that was never solved.

From MangaHelpers:

In 2019, childhood friends Yashio Kaito and Senomiya Akiho are in their last year of high school. Together, they are the only students in the robotics club, which has lost its school funding. Akiho is passionate about robots, and longs to complete building the robot her older sister Misaki began in this same club. Kaito doesn't really care about robots, and is obsessed with video games, specifically "Kill Ballad Online." However, he stays in the robotics club due to his friendship with Akiho. Now, just after Kaito is accused of cheating in his favorite game, Akiho decides to risk her club's existence in exchange for the funding to finally finish her sister's giant robot... [tethysdust]

Let the games begin...

From Bakeneko's Lair:

Poor, poor Akatsuki Homare. He's gotten himself into a mess of trouble. Considering his arrogance, he's getting exactly what he deserves. Yes, Homare, life is a game of give and take. You don't only get to be on the taking side...

Nareh and Tareh are fraternal twins, Nareh the elder sister and Tareh the younger brother. When Nareh learns that Tareh has been accepted into the all-boys Ordinary School, she is shocked, and prepared to stop him at all costs...

Rohan is a young student who dreams of becoming a mangaka. His life changes the day he meets a young woman who introduces him to the world of art. She tells him about sculpture, music, and painting - particularly a "cursed painting" by a Japanese artist long ago acquired by a curator at the Louvre. Then the young woman suddenly disappears.

Ten years later, Rohan, now a mangaka, decides to conduct his own investigation at the Louvre to find the painting that just might lead him to the young woman. But he discovers strange phenomena: does approaching the painting mean death? What does it represent? What is its secret?

[Rohan at the Louvre is the first manga in the comic-art collection published by Musée du Louvre Editions.]

Marie is a shy college student and also a doll maker. Then one day, she is trapped in a gothic mansion by a mysterious young man calling himself "Kahrel." Kahrel demands that she 'creates the "people" that make up the world' for him if she wants to leave. The terrified Marie then has the dolls she's made in past come to life, and are bearing down on her! Gothic Doll Fantasy!!

From MangaHelpers:
There's nothing in the world more enjoyable than reading for Harumi Kazuhito. He spends his days with his head buried in books. But one night when he was enjoying a good story in a café, a violent robber comes in and threatens the people inside. Kazuhito is not the hero type but something came over him and he tried to subdue the robber only to get killed. When he came to, he was reborn as a dog under the care of one of the customers who was in the café that night, Natsuno Kirihime. Through some kind of connection, Kirihime can hear Kazuhito’s thoughts as a dog. Unfortunately for Kazuhito, Kirihime has a bit of a sadistic personality and a thing for scissors.

From Lovers Dream:

Miyuki is a beautiful rich girl who has lost her mother a few months ago and her father suddenly disappeared. Mikage, her butler, lives in her mansion and is her only emotional support that she has.

One day, Miyuki has an obscene dream with Mikage.
Miyuki is hiding her true face, and... also Mikage?

There is a legend that on the seventh night where the sky is dyed in rainbow colors, an invitation will be sent to the most unfortunate person in the whole country. The people of the world dubbed it “The invitation to happiness”. Luludy spends all her fortune to obtain this invitation... but it turns out that not all the legend says is true. Where will it take her?

A strange artifact found inside a silver mine in Central America, annihilates an entire region. The two scientists who stumble into it, are unaware of what could it be or it's potential. In an age where technology seems to have stalled, an anonymous company only known as "Hiraima" releases brilliant futuristic gadgets for free use along with their development plans, without claiming any rights. Furious, the world's leading robotics company wipes out from map the source of their future financial ruin.

About a freelance detective who takes his fees in the form of a trade.

God abandoned the world on Sunday. As a result, nobody in the world can die or reproduce. A little girl, Ai, is the gravekeeper for a village. She has prepared 47 graves for the eventual deaths of every member of the village. Later, a boy who identifies himself as "Hampnie Hambart, the 'Man-eating Toy'," which is coincidentally the name that Ai's mother left behind as the name of her father, arrives in the village and slaughters everybody. Just what is going on?

In a not too distant future, cities are controlled by government guided youth gangs. Those who are not in a gang are marked as outsiders. The silent and mysterious Julian is one of these outsiders, as well as the beautiful Anna. After Julian saved Anna from a beating at the hands of a gang, the story starts...

Following the plot of the game, it switches between the viewpoint of different characters as they face off against each other in the tournament. Commonly following the story from the viewpoint of Yu Narukami, Aigis, Yosuke Hanamura, Mitsuru Kirijo, and Naoto Shirogane as they face off against the other characters. Both Yosuke and Aigis face off against Shadow Labrys.

From Aerandria Scans:

Yakou Hoshino has the ability to create barriers made of water. He then lends his powers to a ‘ghost buster’ company where he meets the agency's only 'real exorcist', a woman named Rasetsu. Though Rasetsu has mysteries of her own including the fact that she’s cursed by an evil spirit, and that she’s the spitting image of Yurara’s guardian ghost.

Yoruko thinks that the murder her brother committed seven years ago is a secret to only between them. But the sudden appearance of the victim's hairpin as a present during Ryuuichirou's birthday party makes Yoruko wonder if somebody else knows about their dark secret.