Deep Insanity

2,185
One day, a large hole named Asylum is discovered in Antarctica. At the same time, the mysterious coma-inducing illness Randolph Syndrome begins spreading around the world. Many countries sent an investigation squad to the asylum, believing it to be the cause of the disease, but not a single person safely returned. Sergiu Sol, a boy with a special resistance to the disease, and Antarctica's jack-of-all-trades Hildegard Olympiada Yamada, decide to take on the challenge of the large hole without a map, but...!? What is the cause of the coma-inducing disease? What in the world is the Asylum? Go down to the deep, jet-black bottom, one with insanity.

Jigoku Kurayami Hana Mo Naki

3,581
A young man who can see people’s sins in the form of youkai gets employed at a sort of odds-and-ends agency run by supernatural beings.

The Case Files of Jeweler Richard

1,153
Follows Richard Ranashinha Dvorpian, a handsome British jewelry appraiser, and Seigi Nakata, a bright and upright Japanese college student. The duo solves various jewel-related cases by unraveling the hidden psychological aspects of their owners that lie within the gems. (Source: MAL News)

Beyond Good and Evil

2,749
Nezu was looking forward to his elementary school reunion—after all, his class was united by unbreakable bonds. But when his former classmate, Mikio, reveals that this reunion is a very real matter of life and death…suddenly Nezu finds those bonds put to the test. By the author of Until Your Bones Rot!

Eastern Strange Legend of Wise Spirits ~ Cheating Detective Satori

1,773
Focuses on Satori Komeiji's endeavors as a detective, solving mysteries around Gensokyo. (Source: Touhou Wiki)

Sachiiro No One Room Gaiden - Seikai No Meitantei

2,123
A spin-off centering on Hijiri Matsubase, three years before he meets xxx. Hijiri Matsubase finally quits the police force and fulfills his dream of running his own detective agency. However, life isn't smooth sailing as it seems, and the poor guy is in massive debt after getting scammed. Luckily, or unluckily for Matsubase, the scammer, Aketoyo, the son of a billionaire reaches out to him for a deal. "Entertain me, I'll pay you ¥10,000,000 per case." A deal with the devil can be oh-so-enticing. (Source: Square Enix, translated)

Chand Ra Has

325
This world was once saved by seven heroes... The heiress of one of those heroes, Himalaya, took on dragons with her abilities, but she was eventually buried in darkness. Search for the truth...! (Source: Kodansha, translated)

The Decagon House Murders

2,433
Seven students, members of their university's mystery club, decide to spend a week-long vacation on Tsunojima Island off the coast of Japan. Six months earlier, the owner of the island was brutally murdered alongside his wife and housekeepers, and the case remains unsolved. Soon after their arrival they begin to suspect that one of their number is intending to kill them one at a time, but who? (Source: Wikipedia)

The Solitary Castle in the Mirror

762
Kokoro is a first year middle school student. Or at least, she's supposed to be. A dark and very frightening experience has left her with a severe case of social anxiety that has her dropping out of school and shutting herself away from the world in her house, where she spends her days dealing with the guilt the disappointment in her parents eyes causes her. One day, the mirror in her room begins to glow. Dragged into the other side of the looking glass by a little girl wearing a wolf mask, Kokoro there finds a fairy tale-like castle and six other children, all close to her in age. The little girl (who calls herself "Ookami-sama") tells them that the one who finds the Wish Key that is hidden within the castle will have a single wish granted. There are no rules, save for one: if they stay past 5 PM, the Wolf will eat them. (Source: KiraKira Treasure Box)

My Student Can't Be a Psychopath

4,369
Jung Intae may be the first to admit he’s a psychopath to the school nurse (his crush), but he certainly isn’t the last. Consequently, Miss Kim’s been dealing with a lot of high school psychopaths... Not that any of them really fit the bill. But dig a little deeper and it seems like everyone at the school, including the faculty, is harboring a secret... Like Intae’s obsession with Miss Kim, and the anxiety Miss Kim seems overwhelmed by at times. Someone at the school really is a psychopath, but who? (Source: Lehzin Comics)

You mean the world to me, Kyouko!

1,345
The manga centers on a "twisted" relationship. (Source: ANN)

Mico is the "Human" Detective

138
London, the city where humans and non-humans reside. Mico Serizawa is a girl with the ability to see things that are not human. In place of her late grandfather who possessed the same ability, she travels to London, determined to help others. Starting from Bill, a man who owns a detective agency and was once her grandfather's partner, what changes are there in store for Mico as many other encounters await her? (Source: Kadokawa, translated)

The Chameleon of "Nibiiro"

639
During the Economic Bubble, everyone, men or women, young or old, lived in a world that was filled with frenzy. In the air where strength overruns weakness, there is a "woman" who tries to avenge her past. But, there's a twist with this "woman". One is that she was a cold killer. Second is that this "woman" is actually a man. (Source: Kadokawa, translated)

Midnight occult civil servants

1,963
Arata Miyako is a new government worker assigned to the Shinjuku Ward Office's "Nighttime Regional Relations" department. Each of Tokyo's 23 wards has one such department, which were established to solve paranormal and occult-related events. Arata can understand non-human speech that no one else understands, and he encounters a youkai at Shinjuku Gyoen park that calls him Abe no Seimei — the name of a historical Japanese occultist and diviner. (Source: ANN)

You should not ask him.

881
Moguri is an unlicensed detective agency that accepts clients other agencies refuse. Its main employees are Kizuna Kagami and Maya Midou, two handsome young men that look nothing like private investigators. Despite their appearances and somewhat questionable behavior, the pair is surprisingly adept at solving cases. In pursuit of the truth, they may in fact uncover more than they are asked to. This is due to Kizuna's secret skill—he is an "empath," able to share in the emotions of the people around him. Kizuna's power goes above and beyond that of others who also call themselves empaths. By "linking" with another person, he is able to take on their talents and even perform feats that would normally be impossible for him. However, after taking advantage of this ability, it is difficult for Kizuna to come back to himself. It is a sobering reality that one day he might lose sight of his own personality—but this is an outcome that Maya, who has been by Kizuna's side since high school, is determined to avoid. [Written by MAL Rewrite]
Total: 801 stories
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