Hikari no Ou 2nd Season

"The line between good and evil is thinner than a razor’s edge."

Noir is characterized by such elements as cynical heroes, stark lighting effects, frequent use of flashbacks, intricate plots, and an underlying existentialist philosophy.

The isolation from society of the typical noir hero was underscored by the use of stark high-contrast lighting. Classic images of noir included rain-soaked streets in the early morning hours; street lamps with shimmering halos; flashing neon signs on seedy taverns, diners, and apartment buildings; and endless streams of cigarette smoke wafting in and out of shadows.

The inherent subjectivity of Expressionism is also evident in noir’s use of narration and flashback. An omniscient, metaphor-spouting narrator frequently clarifies a characteristically labyrinthine noir plot or offers a subjective, jaded point of view. Tension and suspense are increased by the use of all-knowing narrators and flashbacks, in that the audience is always cognizant of impending doom.

The heroes of noir generally share certain qualities, such as moral ambiguity, a fatalistic outlook, and alienation from society. They also exhibit an existential acceptance of random, arbitrary occurrences as being the determining factors in life. Such compassionless pragmatism is found in the most noble, as well as the most tarnished, of noir heroes. The weakest of such characters exhibit an abundance of tragic flaws.

Noir villains are often characterized as homme fatales or “spiders”; in the words of one critic, they are “comfortable in the world of cheap dives, shadowy doorways, and mysterious settings.” They cunningly and ruthlessly manipulate their counterparts to gain power or wealth.

Nevertheless, the noir villains often evoke sympathy, as they are frequently victims of emotional or physical abuse, with such victimization providing impetus for their vengeance. They are trapped in passionless or violent bonds of contract/servitude and resort to murder as a means of escape, usually destroying their conspirators in the process.

Source: Britannica - list will be kept updated

Anime series that covers all of the original source they're based on, with some notes.

Check out the other parts at this link:
https://myanimelist.net/profile/Yuriko_Sakai/stacks
The Stacks are updated constantly so check them every once in a while :)

A big "thank you" to my friend Lorissagg for helping me with some researches :D
Here's his profile if you're interested: https://myanimelist.net/profile/Lorissagg