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Sasaki Rena is a beautiful woman with excellent memory and intelligence. She becomes a private detective and risks her life to chase down evil private detectives, because her younger sister was murdered by a stalker. The person that provided information to the stalker on her sister's location was a private detective. (Source: AsianWiki)

2022, Japan's non-workers regeneration method has been established. Person who does not have income more than six months, is subject to a treatment where they rewrite their brain at a regeneration treatment facility. Tatsuya Kamijou was working in a foreign-owned investment company. One day he loses his job, but six months later, Tatsuya is sent to a concentration camp rather than a playback facility. There he is subjected to worse treatment than brainwashing and training. Why was Tatsuya sent there? (Source: Futabasha)

Lee Woo-hee was kidnapped and found under a plum tree with a faint memory of a man telling her, "I promise you that until the day we meet again, you will be reborn." After that incident, her father became protective and would only allow her to go from the house to the plum tree she loved. However, she would be allowed to venture into the village on the day of the new moon. One such day she meets a exorcist that warns her of a man dressed in black. Will she take this warning to heart? Or is it already too late...? (Source: Forte Atrox)

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)

Side story that focuses on Reki's past.

On the first day of the school year, the incoming students of Class 2-D at Kairei Private Middle School receive an anonymous message ranking them. No one knows what the ranking means, but the students quietly reach a consensus: it is a pecking order. At the very top of the list stands the good-natured Tsubaki Himeyama, but her unbiased kindness soon makes the ranking seem irrelevant. However, tragedy strikes when Himeyama commits suicide in the girls' bathroom. Three days after Himeyama's death, her dazed and grieving friends return to a chilling sight in their classroom. On each desk—including the teacher's—is a different suicide note by Himeyama, 29 in total. Determined to understand why someone so flawless would take her own life, the students begin to share the contents of their individual letters every week. But each of them has a secret to hide, always circling back to the strange ranking and its dark consequences. [Written by MAL Rewrite]

A novice actress, Miku have been appointed the leading role in a play written by a legendary writer. During the play, she bizarrely found herself in the world described in the play—the world has the same setting as what's written in the script, a mansion and 7 inhabitants. For the sake of escaping back to reality, Miku and the inhabitants have to search for a stolen page from the script...

In the Scotland Yard, there is kept a famous miscellany of criminal memorabilia known as the Black Museum. It is rumored that some time in the mid-19th-century, evidence from a certain investigation undertaken by the London Police in 1837 was removed from the collection by persons unknown... Within these pages, an account of monsters, villains, and men unfolds, chronicling a hidden history of the terror of Victorian England—the mysterious figure known in popular folklore as "Spring-Heeled Jack." (Source: MangaHelpers) Also includes the Springald Ibun: Mother Goose.

The events of Danganronpa 2 from Nanami Chiaki's point of view.

Ever since her mother passed away, Nao Sugawara feels like she does not belong in her affluent stepfather's life. She shares no blood relation to him and lives in a constant state of anxiety that she will be sent away one day. Adding to the growing tensions is Kyouko—her stepfather's new wife—whom Nao detests with a burning passion. Desiring vengeance, Nao hatches a plan to fake her own kidnapping in order to oust Kyouko from her life. However, couch surfing at her friends' houses proves fruitless, and Nao returns home to check if anyone noticed her absence. Angered that life seemed to continue on without her, the middle school student decides to drag Kuniko Kusonoki—a clumsy maid of the Sugawara residence—into her elaborate scheme. With a bit of coercion, Kuniko allows Nao to stay in her tiny room while they fabricate their soon-to-be complicated web of lies: all for the sake of revenge. [Written by MAL Rewrite]

In order to remember his forgotten dreams, love, and self, Natsume Kanade, a high school teacher suffering from amnesia, is suddenly visited by a strange man with dark-rimmed glasses who claims to be "God." Natsume Kanade wakes up with a terrible headache from the day before. Wait, what happened yesterday? More importantly, who is he? And who is the the guy with dark-rimmed glasses bossing him around to prepare for school...as a teacher?! Why does everyone know what happened yesterday!? (Source: MU)

One day, Matsui Sakura receives an invitation to a "Revenge Game," and decides to attend. At the location indicated, she ends up locked in a dorm-like building with four of her classmates. It appears that the Revenge Game is being run by a wealthy classmate, Saionji, who was bullied so badly by some of the students that it ruined his life. Now he is taking his revenge, in a brutal game that allows him to have one of his former tormentors killed each morning. However, Sakura—a lonely, quiet, orphan girl—does not understand why she is there, unless it was due to her inaction in stopping the bullying of others. She's also the only one who received an invitation, while the others were abducted or tricked into attending. What is the final purpose of this game? (Source: MangaHelpers)

Masahiko is estranged from his family and lives a dead-end life in Tokyo, working as a chauffeur for high-class call girls. When his sister dies under mysterious circumstances, he inherits an unlabeled CD from her possessions. Listening to the jazz music it contains, he is propelled into an out-of-body experience. As he repeats the experience, he begins to wonder if this was how his sister died. Masahiko is determined to find the cause of her death, and the mystery behind the CD. (Source: CMX)

In this world, there are those who look like humans but are actually beings with supernatural power. In order to respond to crimes committed by these kinds of people, an organization that employs some of their number has been established. Kurohimeyama Eve is a member of this organization, and she is also a teenage girl that has "Oni" powers. One day, she goes to meet a new member, Ichizuka Senya, who is a boy with dangerous shadow powers and a bad personality. In front of the other girls in the organization, though, he seems to act perfectly nice. What's even worse, he's transferred into her private religious school! Kurohimeyama's once-peaceful life will never be the same! (Source: MangaHelpers)

Deimos was once a hansome god. He loved a beautiful goddess who returns his sentiments. The problem, well, she is his sister. For their crime against nature they were struck down out of Olympus. The brother is now a demon and the sister a rotting corpse at the bottom of the ocean. Deimos must choose between his sister and her living human incarnation. His sister is jealous. The girl is horrified and unsure of just what to make of her situation. A classic love triangle turned into a horror story. (Source: ANN)

The temptations of three hormone-fueled boys, space detectives, robots, fairies, and a series of mysterious murders—though seemingly unconnected, the common thread between them is the maze-like apartment complex known as the Skygrazer. To unravel this enigma, a spunky rookie detective named Saeko Sakuraba is on the case, but she may just find all the twists and turns of this labyrinthian dwelling to be a real pain in the neck... (Source: Kodansha USA)

Kashoo, the incredibly popular confectionery and coffee company, produces the most addicting products. However, there is a mystery behind how the company obtains its raw materials. What lurks on the island from which they obtain their caffeine-laden goods? Just what type of contract are people who are hired to work on this island signing? (Source: MU)

Seconds after winning his case, Sehyuk is immediately called to investigate another murder—this time, with a suspect who claims to be his biggest fan. Ideun, the suspect in question who holds the key to the investigation, requests a "private" sitting with Sehyuk, in all essence of the word. As the mystery unveils, unpleasant truths and painful memories rise to the surface once again, plunging Sehyuk deeper into madness. (Source: Lezhin Comics)

After 2050, Tokyo. The sixteen-year-old gifted police detective Kyouko Karasuma works for a special devision in the Asakusa Police Department. Her rather abnormal cases involve: fighting oni, tengu, and other monsters from Asian myths and legends. The modern art by the character designer of Speed Grapher works very well with the action-heavy story line and the overall art improves with each volume. (Source: MU)

Short stories drawn by Aoyama's assistants which do not belong to the main plot.

Ishikawa Ginji is a young man who happens to hate any kind of business related to 'the other side,' such as ghosts, superstitions or the occult. His despise for the matter is such, that he can quickly break up any girl if they show any interest in matters such as lucky charms or any kind of future reading. One day, while he was self pondering about his life while ruining a date on a whim, he is suddenly kissed by an elementary school girl go goes by the name "Ageha," stating that she will use him to "wipe out every ghost in the world." While the sex appeal of an elementary school kid kiss was not enough to turn Ginji to her side, the fact that she "bought him" by paying a huge debt that he had acquired seems to work quite efficiently.

On the day before Norman is set to leave Grace Field House, he goes through various memories he has of Emma and the other kids in the facility. (Source: The Promised Neverland Wiki)

This is a spin off story that occurs about 2-3 years before "Spiral - Suiri no Kizuna". One of the main characters is Imari, who is in love with the kid who wants to be a detective, and which also quit school running after Kiyotaka, and it seems he's dating a murderer without knowing it...? But how is it all connected to the blade children? Not long after, our favorite Blade Children from Spiral appear for the rescue, all manipulated by Kiyotaka. (Source: M-U)

Dakyung, who was an active member of a corporate criminal organization, belatedly learns of the death of her boss, whom she cared for like a father. Later, she discovers the culprit is Chairman Lee, so she sets out on her path for revenge. However, approaching him is no simple matter. That's when she gets a clue related to Chairman Lee's son. For the final mission with her life on the line, Dakyung will have to infiltrate a high school for society's elite. (Source: Naver, translated)