In the midst of a violent invasion of Earth by unknown alien forces, photojournalist Wakatsuki Tetsuya comes across a scantily-clad alien woman, cutting a swath of death through the Terran ranks with her sword. After a chaotic struggle, Tetsuya is knocked unconscious, only to awaken aboard her starship. To his surprise, she turns out to be Kahm, the invaders' princess - and she has picked Tetsuya for a starring role in her upcoming wedding, as the groom.

From Tokyopop:
When Kazura Enomoto’s grandfather dies, he leaves her to the son of a rich family, Mizuki Magahara, as payment for his debts. After she goes to live with him, Kazura learns that she’s not going to be working off the debts as a servant—she’s going to be Mizuki’s fiancée! Unless Kazura can repay her debt, she’s got no choice but to learn to live with her new lot in life. But no sooner has Kazura begun to adjust to living with Mizuki and going to his snotty rich school than the dark secret of the Magahara family comes to light. The head of the family has the unique power to bring back the souls of the dead—and right now the head of the family is Mizuki!

Our protagonist, Outarou Kiyohime, is rather prone to getting pushed around. At the orders Nagi and Kanade, a pair of gorgeous twins who head the student council, he goes off to ask the "Devilishly Hot Club", who are unlawfully occupying their club room, to kindly leave. But then, the club Captain, Fiolentina, falls for Outarou at first sight. She does nothing but hit on him, and he just can't get down to business. In the end, will Outarou be able to have them leave the room as per his orders? This is a soft and squishy 4-panel gag strip about a high school boy who is, for some reason, too popular with the ladies for his own good.

Shibuya Mirai is stuck in a world where heroes seem to no longer exist. Already on his first day at a new school, he's targeted by a group of delinquents. Right as his situation seems hopeless, a real hero finally appears before his very eyes.

The "daily life comedy" manga centers on an elementary student named Sakura who summons a demon named Seere and asks him to become her mother.

Fateful Encounters:

Saitou Yakumo, a college student, was born with different eye colors. His red left eye gave him a special ability to see ghosts and spirits. He believes ghosts and spirits are bound to earth because of a certain 'cause' and simply by eliminating that 'cause' will help those spirits rest in peace. Being asked for help by Ozawa Haruka, together they begin their investigation.

In order to treat his sister's mental illness, the young man Leo resorts to treatment through magic. There, he meets a magician, Oswald, who enters the patient's psyche in order to treat them. In a world filled with Madness, will they be able to save the patient's heart and get out alive...

One day, Nana, who has always wanted to get married, has a fateful encounter. Unfortunately, she had to endure violence since the marriage, so she decided to kill her husband and put his corpse in a freezer, but things aren't always like one want as she finds out when he comes back…

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.

In the near future: A world renowned mathematician / physicist Francis Dullam loses his left brain hemisphere and retires from hard science to study dolphins. Several years later he comes up with the new thesis which is essentially a collection of dolphin footage. As the "thesis" is being severely criticized by the media, Ishii Mitsunari (a student living in America) discovers the idea hidden there, that will help to create the true Artificial Intelligence.
Motivated to create the AI first Mitsunari leaves for Okinawa to follow the footsteps of Dullam.

Two girls, Ichinose Haruko and Nikaido Natsuko, bump into each other by accident, resulting in a kiss and them swapping bodies.

The only way to swap back is to kiss again...

Spin-off volume Noragami Shuuishuu- featuring one man’s unlucky venture into love (a familiar face for those who’ve watched episode 4 of the anime)!

Nam Ji-il rolled into the high school that is famous as the Royal Kingdom of the delinquent. On the first day of school, he becomes a well-known bread shuttle boy in the entire school. While suffering from chronic heart disease, his weak body also has to suffer from assault any other kind of bullying, however, caused by an unexpected event his life reaches its turning point...

What happens when a tired old couple is given a second chance to escape their married life and start over? Through a twist of fate and a magical coin, Chastity and Valor are thrust back to their teenage years- to an age before they were wed. Will they take this opportunity to part ways for good or rekindle a love they never had?

In this story, Nagai gets his folklore on with every chapter containing a lot on Buddhist lore or Japanese folklore. The prologue introduces us to Heaven, Incorporated, a company with a particular staff that hunts down all sorts of supernatural monsters and protects humanity from them.

A muscular youth who grew up in a rural environment has finally found his springtime high school life, and it turns out his romantic partner is the most popular girl of first year?! But, the truth isn't as straightforward as the muscular youth believes it as...

‘Vampire’, ‘zombie’, and ‘human’
If it were you, which one would you choose?

It all started from making a selection in a social game. But what if the selection that you casually chose in the game became reality?

From the author of MachiMaho and Black Gyaru School comes Souryuu's newest work.

Notes:
0 = the latin letter "O", 4 = the japanese kanji "shi", R = the latin letter "r", 1 = the latin letter "i". So "04R1" becomes "Oshiri", japanese for that sweet ass!
Links:
Author's Twitter: https://twitter.com/Souryu_STD

A heart-warming story of how a neglected orphan, Yuu, has been blessed with the offering of a free wish by a demon, and he simply asks her to become his older sister.

A series of one-shots based on the Diabolik Lovers otomegame.