Best Mystery Manga of 2019

Ryuunosuke Akutagawa lives in the slums, using his ability to beat up anyone who dares lay a finger on his sister, Gin, or his friends. But his life takes a turn for the worse when armed criminals come after his gang, killing them in the process. In an attempt to avenge his friends, Akutagawa finds himself on the verge of death. A mysterious man dressed in black greets him, saying that he will take care of his sister until Akutagawa is ready to challenge him again. More than four years have passed, and there is still no sign of the man in black or Gin. Even so, Akutagawa refuses to give up on his search. When Sakunosuke Oda takes pity on his living conditions and invites him to become a member of the Armed Detective Agency, an opportunity arises for Akutagawa to finally get a lead on Gin's whereabouts. Unbeknownst to him, however, Gin is guarded by none other than Port Mafia's wicked leader, Osamu Dazai, and his successor, Atsushi Nakajima—the infamous "White Reaper." To save his sister, Akutagawa must overcome his weakness and sacrifice it all.

There is a strange rumor surrounding the Urashima Tunnel: it grants the wish of those who enter at the cost of their lifespan. Kaoru Touno did not think much of this silly urban legend until he stumbled across a dark tunnel one night. Initially dismissing the idea of going in, Kaoru is enticed by the possibility of bringing back his sister, Karen. Karen had died in an accident five years prior as a result of Kaoru's carelessness. As he enters the tunnel, what Kaoru discovers within is not quite the same as the rumors imply. The rules of the tunnel are uncertain, but that does not stop him from testing the waters. Unbeknownst to Kaoru, his aloof classmate Anzu Hanashiro follows him on one of his expeditions. Much to his reluctance, she is intrigued by the tunnel and wants to team up with him. Although he is wary of her intentions, Kaoru accepts Anzu's offer and spends the summer with her in hopes of reviving his sister.

Kimihiko Kimizuka is a crisis-magnet. From getting caught up in a crime scene to accidentally witnessing a drug deal, trouble seems to find him around every corner. So it is no surprise when his rather mundane flight suddenly enters a state of emergency with a dire need of a detective onboard. Unfortunately, his attempt at avoiding trouble is foiled by a beautiful girl with silver hair who goes by the codename Siesta. Declaring herself a detective, she unceremoniously drags Kimizuka into the case as her assistant. That incident spelled the beginning of an adventure around the globe that went beyond his wildest imagination. Putting their lives on the line, the two took down criminal organizations, prevented disasters, and saved thousands. But the curtain closed to their epic journey with Siesta's untimely death three years later. Resolving to live an ordinary high school life this time, Kimizuka spends a year maintaining a low profile. However, as fate would have it, a girl with an uncanny resemblance to Siesta comes crashing into his life, threatening to throw his peaceful days into disarray.

It is common knowledge that nobles will do anything for power; lying, manipulation, and extortion are the usual tactics. However, one family is exempt from this generalization: House Grail, whose main tenets are truth and integrity. The youngest daughter, Constance Grail, is just as moral as the rest of her family, believing in always doing the right thing and helping those in need. However, these ideals do not help her when her fiancé cheats on her with another woman. Framed by his lover in the hope of her downfall, Constance has no one to hear her pleas for justice. Everyone turns a blind eye, save for one—the spirit of the infamous Scarlett Castiel—who possesses Constance and turns the tables on her accuser. However, this aid does not come without a price. Ten years ago, Scarlett was executed for the attempted murder of Princess Cecilia. But this was actually a setup; as blunt and harsh as Scarlett could be, she would never stoop so low as to use poison. She has no idea who orchestrated her incrimination, but Scarlett demands that Constance—as the only one who can see her—help her exact revenge on all those who wronged her!

Shizuki Aoi entered high school and thought he found a new, lifelong friend in fellow first-year Kanata Takemiya. However, as a result of their meeting, Aoi dropped out at the age of 16 and left home at the age of 20. Now, he lives alone in a cramped Tokyo apartment that he rarely exits, poorly coping with depression and a broken heart. Meanwhile, Tsumugi Sakura attends high school in the distant Kanagawa prefecture. She stands out among her peers due to her gloomy nature and vibrant violet hair. While she is overtly bullied by her classmates, only the handsome Subaru Minazuki will intervene on her behalf, but she is far from grateful to him. Little does she know, Minazuki has his own reasons for singling her out. Aoi and Sakura both believe that life will not improve as long as they remain the same. If only they could switch places with someone else! But when the miraculous happens, they fail to appreciate just how little their situations differ from before. Like tea made from the blue mallow flower, which transforms in color but not taste, the two have yet to change in a way that truly matters.

A world stretching down from the heavens: the Vertical World. There lives a boy named Ruska, who finds himself fascinated by the world below. One day he sees a girl falling from the sky above, straight towards the bottom... And so begins his adventure surrounding the mystery of the Fallen Maiden!

A spin-off taking place 7 years before the events of Meitantei Conan which focuses on Rei Furuya, Jinpei Matsuda, Kenji Hagiwara, Wataru Date, and Hiromitsu Morifushi during their time at the Metropolitan Police Academy.

It's 1935 in Gyeongseong, and struggling artist Iho Yun has been commissioned by the reclusive, elderly Madam Jeonghwa Song to paint a portrait. Madam Jeonghwa Song allows Iho to set eyes upon her—an unprecedented event—and standing before him is a young woman. But why does she ask him to paint an elderly version of her? "Don't finish the portrait." Tucked between the previous artist's paint tubes is an ominous letter. Iho learns that no artist has left Madam Song's abode alive or of sound mind. Just what is she hiding and what will happen if Iho finishes the portrait?