Takahashi Rumiko contributed this short autobiographic piece to the 2014 Big Comic Original Godzilla 40th anniversary special edition.

One ruler...One schemer...and...One assassin The kingdom of Juushin is suffering at the hands of a cruel emperor. In order to stop his father's rule of tyranny, the crown prince will enlist the aid of a legendary assassin with reasons of her own for wanting the emperor dead.

From Tokyopop:
When you come from a family of exorcists and mediums, you're expected to have certain powers. But despite having a psychic lineage, Kouhei Midou can't predict the future, nor can he see dead people. He's powerless in every sense of the word. However, he does think fast on his feet--and with a little help from his psychic cousin Seiji, he's an amazing crime solver.
The mystery he wants to solve more than anything is his mother's tragic disappearance. But it isn't easy... especially in this world, where nothing is as it seems. Cats talk, blood-sucking vampires roam the earth, and monsters eat guys like Kouhei for breakfast. Can Kouhei survive this chaos long enough to find the mother that he's lost?!

Based on the PlayStation 2 game of the same name. A teenager who was orphaned as a young boy returns to the city of his childhood. Shortly after transferring to Gekkoukan High School, he is attacked by Shadows — creatures that feed on the minds of their victims. He soon discovers that he shares a special ability with other students at his new school. From them, he learns of the “Dark Hour,” a hidden time that exists between one day and the next, swarming with Shadows. He joins the Special Extracurricular Execute Sector (SEES), and with his new friends, confronts the threat of the Shadows.

A one shot situated in ancient china, around the Spring and Autumn period. Two childhood friends meet on the battlefield, reminiscing their past before the final battle.

This manga is about a girl who debuted as a mangaka at the age of 13, but no longer has any work as a mangaka at the age of 19. She decides to once again be a mangaka after reading manga by someone named Sachi and since girls love and boys love is currently popular she decides to go out with a girl coworker named Morishita who is in love with her to gain experience for her manga. However, she finds out that Morishita is Sachi!

A girl finds out her quiet classmate's secret and decides to blackmail her.

From MangaHelpers:
The world is in a war against an alien race called "Mimics," who have taken over most of the world with a mission to eliminate the human race. Keiji Kiriya is a new recruit in the United Defense Force, which is battling against these "Mimics." On his first day of deployment, Keiji and his unit encounter "Mimics" and are all killed... Or was it all a dream? For some inexplicable reason, after every time he dies, he is resurrected and returned back to the day before the battle. Why does this happen to Keiji and how can he escape from this never ending cycle?

Note: Nominated for the Eisner award for the "Best U.S. Edition of International Material - Asia" in 2015.

Kyoya Ida is a hard-nosed detective from the Shinjuku Police precinct. He is known in the force as an unreasonable type who would use lethal force to solve cases, making him unpopular with the enlisted and high-ranking officers in the National Police Agency.

Despite this fact, there are some in the force that admire Ida for his bravery and cleverness in using lethal force to solve criminal cases whenever legal means are met in a dead end.

There is something a bit twisted inside of the teenage girl Madoka. It comes out one day when she has to deal with a groper on a public train. He may be scarred for life by the time she's finally through with him but for her, at least, this encounter may only be the beginning.

Alternative note: If you are a male sub or a Female Dom, then this manga might be to your liking. If you're a Male Dom, then go read Nana to Kaoru instead of this. Nana to Kaoru is a much happier Dom/sub romance manga, whereas Ibitsu turns dark toward the end chapters.

Imagine living in a town where supernatural beings stalk the night for their next prey. Toukei Ibun takes place 29 years after Tokyo was established as the capital of modern Japan. Manzou is the owner of an inn in the town of Asakusa. His friend Hirakawa is a journalist who is investigating the bizarre crimes that keep occurring all over the city in the dead of night.

As boys, they always made fun of the person rumored to live in a quiet, old house, even though they never saw her.

Now, years later, one of them wonders if that person is still alive and approaches the house.

An irreplaceable "spot..." and the greatest friends in the world! Just when it seems like peaceful everyday life will continue forever, disaster strikes, and that's when these men move to protect what matters most to them! A compilation of stories about the legendary boys of Hiroshima!

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2011, Seta Souji moves to the countryside to his uncle's house due to his parents working abroad. Not very friendly, he however managed to make a few friends there, and they all decide to solve the mystery behind the sudden cases of serial murders that strikes the area.

Fubuki, a man with silver hair and black eyebrows, is somewhat of an expert at taking care of people's monster problems, for a price of course. Yoru is a strange orphan girl who runs across one of his fights with a demon cat and insists on becoming his student. The two of them make an amazing team, whether they're fighting monsters or (as happens more often than Yoru would like) running from them!

The story is about conjoined twins, a boy and a girl, and how they - in the wake of the Great Kanto Earthquake of 1923 - come to live with a travelling freak show.
-from Caterpillar

In the centuries to come, humankind as we know it will be all but extinct. Tiny fairies become the dominant species on Earth. This series of laid-back reports follows one of the few surviving humans, a girl who tries to befriend and study the fairies while also digging up relics of our civilization (CDs, etc) to her great wonderment.

A short, wordless, story about a high school boy and his unrequited love.

Billionaire Tono Ryuichi, the President of Tono Foods Group, a giant food company, recently acquired two young female assassins from the Mexican cartel. Sui and Ai came from unimaginably poor childhoods and were given a choice between killing people or selling their body. They chose the former and went through an inconceivably extreme training and, at 17 years old, they have become one of the deadliest assassins in the world. They are absolutely obedient to their master and they are given the task of finding the killer that poisoned Ryuichi´s wife and child. They begin attending high school to blend into society and, at the same time, read and study which helps them become even more deadly on the field. Sui and Ai encounter Matoba Imari who is a high school assassin herself and may be more skilled than both of them. But unlike the two, Imari just wants to lead a normal life. Whatever Imari wishes for her life is not their problem, because the only things Sui and Ai feed on are bloodthirst and a challenge.