MYSTERY

26
R

Jigoku Shoujo

It is said that if someone seeks revenge, they should dig two graves—and this is especially true of those who use the Hell Correspondence website. At the stroke of midnight, this ominous web domain becomes accessible, and whoever inputs the name of their grudge will get a visit from Ai Enma, the Hell Girl. Ai explains that she will send the target's soul to hell, but the requester will also end up in hell when they die. For some, that price is far too steep; for others, where they will spend their afterlife has no bearing on their current, day-to-day hell. But one thing is certain: the Hell Girl will always be available to those in need of revenge, while she stoically performs her duty of ferrying souls into the darkness.
TV Fall 2005 7.6
12
R

Babylon

In the newly formed Shiniki district of Tokyo, Zen Seizaki is a diligent public prosecutor at the Tokyo District Public Prosecutors Office. Assigned to a case involving false advertisement, Zen—along with his assistant officer, Atsuhiko Fumio—investigate Japan Supiri, a pharmaceutical company that had provided fabricated clinical research on the company's new drug. While investigating the file of Shin Inaba, an anesthesiologist connected to the crime, the case takes a dark turn when Zen finds a page stained with a mixture of blood, hair and skin, along with the letter "F" scribbled all across the sheet. As he investigates further, the case goes beyond Zen's imagination and becomes vastly complex, challenging his sense of justice and his knowledge of the truth. Digging deeper into the investigation, Zen begins to uncover a concealed plot behind the ongoing mayoral election and ties to many people of interest involved in the election and those closer than he thinks. The case grows more severe and propels Zen into an unforeseen hurricane of corruption and deceit behind the election, the establishment of the Shiniki district, and the mysterious woman associated with it all.
TV Fall 2019 6.74
26
R

Betterman

Keita Aono is an ordinary high school student who loves to chat with his friends about military technology and the girls in their class. One day, Keita is surprised and delighted by a new transfer student in his class, his childhood friend Hinoki Sai. But when Keita tries to catch up with Hinoki after school, he accidentally wanders into Bottom World—an underground amusement park whose opening was canceled due to an unexplained tragedy. As Keita explores the area, he eventually finds Hinoki in the cockpit of a strange robot. She is here on behalf of Akamatsu Industries, a company contracted with the secretive international organization Mode Warp to investigate strange cases of violence worldwide. After joining Hinoki in the robot, the pair attempt to defend themselves against the various attractions of Bottom World, which have come to life and become violent. However, they are unable to escape until a man with transforming powers—dubbed "Betterman"—joins their struggle. Faced with an enemy he does not understand and a slew of mysterious new technology, Keita joins Akamatsu Industries in a fight against a force they call "Algernon."
TV Spring 1999 6.57
2
R

Kuroshitsuji: Book of Murder

At the behest of the Queen, Earl Ciel Phantomhive hosts a lavish dinner party attended by several of the finest members of polite society—as well as struggling author, Arthur. But as the party reaches its high, a terrible murder takes place and none other than the Earl himself is suspected of the crime. As a violent storm rages on outside, the death count continues to climb. The Phantomhive household and their eminent guests find they must cooperate in order to solve this mystery before they too fall prey to the mysterious murderer. However, it seems that not even the perfect butler, Sebastian Michaelis, is safe from this horror.
Ova Winter 2015 8.05
R-17+
1
8.25
R-17+
12
6.52

Blood-C

TV Summer 2011
R-17+
12
5.47

Bloodivores

TV Fall 2016
R+
12
7.15
R-17+
25
7.14

Kaze no Youjinbou

TV Fall 2001
R-17+
13
7.13

Mouryou no Hako

TV Fall 2008
R-17+
12
7.02

Joker Game

TV Spring 2016
R-17+
13
6.38

Kagewani

TV Fall 2015
R-17+
13
6.41

Kagewani: Shou

TV Spring 2016
R+
12
8.14

Kaiba

TV Spring 2008
R-17+
12
7.23

Kakegurui

TV Summer 2017
R-17+
12
7.19

Kakegurui××

TV Winter 2019
PG-13
44
7.46
PG-13
13
7.08

Karneval (TV)

TV Spring 2013
R-17+
12
7.37

Kemono Jihen

TV Winter 2021
R-17+
148
7.94
PG-13
1
7.9
R-17+
12
6.98

Kokkoku

TV Winter 2018
R-17+
25
8.48

Summertime Render

TV Spring 2022
R-17+
12
5.07
PG-13
12
8.39

Houseki no Kuni

TV Fall 2017
PG-13
36
7.16

Karakuri Circus

TV Fall 2018
PG-13
6
7.19

Kakegurui Twin

Ona Winter 2022