Top 10 Underappreciated Action Mystery Anime You Should Watch.

10. Darwin's Game

 Kaname Sudou a High school student receives an invitation from a classmate to play a mobile game "Darwin's Game".as soon as he opens the application, a green snake suddenly pops out from his phone screen and bites his neck, leaving him unconscious. Waking up in the infirmary, he is told by the school to take the rest of the day off. Unfortunately, his curiosity gets the better of him and he uses the application once again. He is relieved that it is a usual game. But the pleasant surprise is

short-lived, as his in-game opponent unexpectedly appears right in front of him and attempts to hunt him down with a knife.

Genre: Action, Mystery, Shounen
Episodes: 11
Status: Completed
Other name: ダーウィンズゲーム

 9. Blast of the tempest

An ordinary teenager Yoshino Takigawa is dating his best friend Mahiro's younger sister. But when his girlfriend Aika dies Mahiro disappears, vowing to find the one responsible. Yoshino continues his life as usual until he is confronted by a strange girl who holds him at gunpoint, and his best friend arrives in the nick of time to save him. Yoshino, Mahiro, and Hakaze save the world while inching ever closer to the truth behind Aika's death.

Genre: Action, Drama, Fantasy, Magic, Mystery, Psychological, Shounen
Episodes: 24
Status: Completed
Other name: ZETSUEN NO TEMPEST

 8. Wolf's Rain

"When the world ends, the gateway to paradise will be opened" is an ancient legend. But the legend also dictates that only wolves can find their way to this mythical realm. A lone wolf named Kiba finds himself in Freeze City, an impoverished town under the rule of the callous Lord Orkham. Kiba discovers Hige, Tsume, and Toboe have been drawn in by the same aroma. The wolves set off on a journey across desolate landscapes and crumbling cities to find their legendary promised land. However, they are not the only ones seeking paradise, and those with more sinister intentions will do anything in their power to reach it first.

Genre: Action, Adventure, Drama, Mystery, Sci-Fi
Episodes: 30
Status: Completed
Other name: Wolf Rain

7. Mo Dao Zu Shi

Xian: the state of immortality that all cultivators strive to achieve. Mo Dao, there is dark energy that lies underneath. Wei Wuxian through an unfortunate series of tragedies follows Mo Dao. His rise in power is accompanied by chaos and destruction, which gets him killed by a close ally. Wei Wuxian is reincarnated after thirty years and the beginning of a supernatural mystery that plagues the clans and threatens to disrupt their everyday life.

Genre: Action, Adventure, Comedy, Historical, Mystery, Supernatural
Episodes: 15
Status: Completed
Other name: 魔道祖师

6. Eden Of the East

"Careless Monday" on November 22, 2010, Japan was hit by missile strikes that fortunately did not harm anyone. Saki Morimi's life is forever changed when she finds herself saved from unexpected trouble by Akira Takizawa. Takizawa is cheerful, but odd in many ways. He possesses a strange cell phone loaded with 8.2 billion yen in digital cash. However, unbeknownst to her, this is the beginning of a thrilling death game involving money, cell phones, and the salvation of the world.

Genre: Action, Comedy, Drama, Mystery, Romance, Sci-Fi, Thriller
Episodes: 11
Status: Completed
Other name: Higashi no Eden

5. Land of the lustrous

Crystalline organisms called Gems inhabit a world that has been destroyed by six meteors. Each Gem is assigned a role in order to fight against the Lunarians. Phosphophyllite, also known as Phos, is a young and fragile Gem. Phos meets Cinnabar, an intelligent gem who has been relegated to patrolling the isolated island at night because of the corrosive poison their body creates. After seeing how unhappy Cinnabar is, Phos decides to find a role that both of the rejected Gems can enjoy.

Genre: Fantasy, Sci-Fi, Seinen
Episodes: 12
Status: Completed
Other name: Country of Jewels

4. Gleipnir

Shuuichi Kagaya considers an average high school student, but sometimes, he turns into a monster. One night, he finds a building ablaze with a girl trapped inside. Deciding to save her, he transforms and carries her to safety, but accidentally drops his phone. Claire Aoki the girl he saved, finds him and confronts him about his monster identity. As it turns out, Claire has a secret of her own: she has been searching for her sister, who also became a monster.

Genre: Action, Ecchi, Mystery, Seinen, Supernatural
Episodes: 13
Status: Completed
Other name: グレイプニル

 3. Ajin 

Mysterious immortal humans are known as "Ajin" which first appeared 17 years ago in Africa. Whenever Ajin is found within society, they are to be arrested and taken into custody immediately. Kei Nagai is a high schooler who knows very little about Ajin. Kei is taught that these creatures are not considered to be human, but he pays little attention to it. However, as he finds himself alone on the run from the entire world, Kei soon realizes that more of his species may be a lot closer than he thinks.

Genre: Adventure, Horror, Mystery, Seinen, Supernatural
Episodes: 13
Status: Completed
Other name: Ajin: Demi-Human

2. Bungou Stray Dogs

While starving on a riverbank, Atsushi saves a rather eccentric man named Osamu Dazai. Dazai has been investigating the same tiger that has been terrorizing the boy. Dazai has been investigating the same tiger that has been terrorizing the boy. Atsushi is coerced into joining their firm of supernatural investigators, taking on unusual cases the police cannot handle, alongside his numerous enigmatic co-workers.

Genre: Mystery, Seinen, Supernatural
Episodes: 12
Status: Completed
Other name: Literary Stray Dogs

1. The Garden Of Sinners

In September 1998, a string of seemingly random suicides leaves Japan baffled and devastated. A detective agency specializing in paranormal occurrences notices that there are a few glaring, disturbing similarities. All the victims are schoolgirls, and all of them have jumped to their deaths from atop the ancient Fujou Building. To investigate the cause of these disturbing events, the head of the agency, Touko Aozaki, dispatches Mikiya Kokutou and Shiki Ryougi. Shiki, who possesses the "Mystic Eyes of Death Perception": an abnormal ability that allows her to see, and bring, an end to all things.

Genre: Mystery
Episodes: 7
Status: Completed
Other name: 劇場版 空の境界 the Garden of sinners