Hyakkaou Private Academy. An institution for the privileged with a very peculiar curriculum. You see, when you're the sons and daughters of the wealthiest of the wealthy, it's not athletic prowess or book smarts that keep you ahead. It's reading your opponent, the art of the deal. What better way to hone those skills than with a rigorous curriculum of gambling?
At Hyakkaou Private Academy, the winners live like kings, and the losers are put through the wringer. But when Yumeko Jabami enrolls, she's gonna teach these kids what a high roller really looks like!

Note: Placed 3rd in the DaVinchi x NicoNico Tsugi 2016 Manga Awards.

Shinichi Kudo is a high-school student who, by using observation and deduction, is good at solving mysteries. While investigating one, he is caught by the criminals that he was watching and forced to take an experimental drug. Leaving him for dead, the criminals disappear. Instead of killing him, however, the drug turns Shinichi into a little kid.
To preserve the illusion of his 'disappearance,' Shinichi adopts a new name based on his favorite author (Arthur Conan Doyle) and becomes Conan Edogawa. Ran, his (actually Shinichi's) childhood friend takes this little boy under her wing and brings him to her home.
Conan now lives at a detective agency run by Ran's father, but his mind is as keen as ever and he continues to solve mysteries... always allowing Ran's father to take all the credit.
As far as everyone's concerned, Conan is just a little kid anyway... even to Ran. This is *extremely* frustrating to Conan since nobody will listen to a 'little boy.' Despite this, Conan has a mission... to find the criminals who did this to him and get the antidote to that drug.

Note: Won the 46th Shogakukan Manga Award in the shōnen category in 2001.

Even in this day and age, Ninjas walk among us, hide within plain sight, still waiting for their mission orders. However, for some, it takes much longer to receive orders than others! Meet Kumogakure Kurō, a NEET and a Ninja. After being a long time without work, he finally receives orders from the higher ups!

When the chant "Eko Eko Azark" sounds, something is bound to occur, be it within the town or the school!

A classic horror manga, Eko Eko Azarak follows Misa Kuroi, a witch who transfer to a new school and the bizarre horrors which she encounters there.

While relatively unknown outside of Japan, the series was extremely well received domestically. It lasted for 19 volumes, and spawned a six volume sequel, an OVA, two TV series and six live action films.

From Nyan-Nyan Rampage:

"The final arc of the story begins...

When Takao Osugi receives the mysterious "Universe of the Four Gods" book from his mentor, Einosuke Okuda, he does everything to keep it away from his young daughter, Suzuno. But when disaster strikes Tokyo, can he still protect her from her fate?

Shortly after the tragic finale of Genbu Kaiden, young Suzuno Osugi's tale as the Priestess of Byakko beings to unfold!"

In order to eat me, my enigmatic stalker is protecting me from other strange women―

A high school boy, Sakurai, has a secret he cannot tell anyone: he has been plagued by stalkers since he was a child.
One day, his classmate, Ueda, suddenly transforms into a monster, revealed to be one of his stalkers.
Miyako, who has always been closely following him, appears and saves him.
She tells Sakurai that the monsters, commonly known as urban legends in Japan, are after him because they love him.
What will be the fate of Sakurai who is loved by countless creatures disguised as beautiful girls?

Links:
Author's Pixiv: https://www.pixiv.net/en/users/25451722
Author's Twitter: https://twitter.com/tadaresan

In a near-future where humanity stands on the edge of extinction, we turn our gaze to the stars. But in the depths of space, a new menace looms—the 'Star Beasts.' To combat these creatures, warriors donning mechanical armor emerge as humanity's last hope.

Seven women, one man, a suspenseful harem story!

During a class reunion, the school became an enclosed dimension without warning. Yelling and screaming brought no response. 26-year old unemployed Haruka Sato has to survive by cooperating with seven of his former classmates. Soon, the extreme conditions began to eat away at their sanity, and Haruka's hidden desires began to take hold.

Lin Jie is an otherworlder who manages a bookstore. He’s kind and always recommends soul-healing books for his dejected customers. Sometimes he’d even share his own works too. As time goes on, these customers start to respect him a lot. They bring simple local products every day to show their gratitude and ask for book recommendations. They even start telling tales of this ordinary shopkeeper. His respectful and cordial titles include “Hyena of the Evil God”, “Herald of the Flesh Gospel”, “Author of Cultes des Goules” and “Shepherd of the Stars”???

This is a continuation of the story of Higanjima, featuring an isolated island surrounded by fish demons and a population of warring vampires and humans. Ryousuke, his girlfriend Kazumi, and his friend Yamaoka are shipwrecked by the fish demons and wash up on the shore of this cursed island. They soon encounter the inhuman cruelty of the vampires first hand, before Ryousuke is able to meet up with the human resistance. Ryousuke wants nothing more than to escape the island, but mainland Japan may not be safe for long. If the humans don't defeat the vampires soon, then the vampires will succeed in their plans to spread the virus to the mainland!

In a deserted post-apocalyptic metropolis riddled with a mysterious material a young girl is searching for any signs of life and supplies.

Ura baito, also known as a shady part-time job. A gray area job that pays very well. The price you pay is your life.

Yume Kokuryo and Nagomi Shirahama are seeking a large sum of money for some reason. To that end, they casually dive into various shady part-time jobs.

This work may affect you physically and mentally. Read it at your own risk. We are not responsible for any damage to your health.

The first official Touhou webcomic written by ZUN and drawn by newcomer Ginmokusei, featuring Satori Komeiji as the master armchair detective from the depths of the Earth.

This is no different from ordinary villager life...
"There can be no one stronger than me in this world!"
To become the strongest, Yuria, the Sea Queen, went ashore in search of the Demon King. But when she looked at her reflection, she saw the face of a child. In exchange for her legs, she lost all her strength... Even so, still striving to become the strongest, Yuria begins a painful journey!

Five years ago, my first love, Cha Mia, disappeared. Now, she has reappeared before me, completely changed.
An unexpected reunion at the police station… and she turns out to be a freshman at the same university?

The story of two people who thought it was over begins again on campus... or so I thought, but she still insists on letting the past go.

With the sudden acquisition of the ability, Kang Mina’s life is completely turned upside down. Now, she stands at a crossroads where a single choice can lead to irreversible consequences. Amidst anger, confusion, and a suppressed sense of justice, Mina struggles with how to use her newfound power as she embarks on a new journey. Where will her power take her?

Faceless shadow nobles living in a vast mansion, attended by living dolls who spend much of their time cleaning up the soot endlessly emitted by their mysterious masters.

Follow the story of Emilyko, a young and cheerful living doll, as she learns her duties serving as the attendant for Kate Shadow-sama.

Vlad, Luke, and Tauryu work in Café Forbidden, a mysterious coffee shop that only opens at night.
The three men look pretty normal, but they hide a secret they cannot share with anyone: every evening, they rush around London to uncover the mysterious incidents that take place in the city.

Thirteen years ago, suddenly the Villainous Army of evil appeared in their gigantic floating castle 10000 meters in the sky to invade Earth! The villainous army have reviving capabilities that make them immortal, making them a serious threat to humanity. To protect us against these invaders, the Divine Dragon Rangers, the Dragon Keepers, wield their miraculous powers and their weapons, Divine Tools, and continuously fight for our safety! The assault of the Villainous Army! The vigilance of the Dragon Keepers! Will they succeed in their conquest…? Find out in the action-packed superhero series of a lifetime!

From Haruba Negi, the creator of 5Toubun no Hanayome.

The manga is based on Weizard's cellphone novel of the same name. The novel centres on Asuka, a high school student who sees the apparition of a dead student named Haruka, asking Asuka to find her body. As the story progresses, Asuka and her friends attempt to find the eight scattered pieces of Haruka's corpse in the school, and learn more about the Red Person that is hunting them as they do so.

The Red Person hunts students who are alone at school to kill them, and until they exit the school gates, the Red Person will keep appearing before them. When the Red Person kills a student, it scatters the student's body into eight pieces, and tasks another person to find the pieces in the school. If Asuka fails to find Haruka's body, the day will keep repeating and she and her friends will keep dying until they do.