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-Best (and underrated)- Seinen, Psychological, Horror, Thriller

(In no particuar order) Best thriller, horror, or psychological manga/hwas I've read. 

Some are straight-up horror, some deal with the psychological sides of life, and some are just dark action. Mostly completed and long (50+ chapters)

Most of them are underrated, and I only added mainstream manga that I’ve already read.
All(60) / manga(60)

Shokuryou Jinrui

 9.3(384 voted)
Complete
Author(s): Kuraishi Yuu,Mizutani Kengo
Genre(s): Horror / Seinen

Summary: Think Yakusoku no Neverland, but darker. This isn't insanely gory, but not for the faint of heart. Good characters, great plot, kind of an unsatisfying end, but really good.
8.5/10

11 02,2021

children

 8.5(211 voted)
Complete
Author(s): Miura Miu
Genre(s): Drama / Horror / Mystery / Psychological

An 18 year-old finds a good summer job. Babysit kids with one other for a while, and get 3 million yen. Easy enough, right? But what happens when those kids turn out to be able to kill without blinking.
Pretty good, kinda cliche ending, but definitely worth a read. Sort of confusing.
7.8/10

11 02,2021

Death Note

 9.6(234 voted)
Complete
Author(s): ohba tsugumi
Genre(s): Action / Drama / Mystery / Psychological / Shounen / Supernatural / Tragedy

Bored teenage Yagami Light finds the Death Note, which kills anyone who's name you write in it. He starts using it for his 'virtuous' goal, but what happens when the seemingly bad is good, and good is evil?
Obviously, this is on here. From a Shounen magazine, Death Note is arguably the most popular psychological anime, if not manga. This is full of twists and turns while keeping its shounen elements, and is one of the best manga I've ever read.
9/10

11 02,2021

Litchi Hikari Club

 8.3(865 voted)
Complete
Author(s): furuya usamaru
Genre(s): Adult / Drama / Horror / Mature / Psychological / Shounen Ai

A group of boys who go to an all-male school band together to make a robot. Why are they building that robot? To make it kidnap girls for their leader. With many twists and turns, the robot eventually gains feelings for a particular girl, and with that comes the demise of the Hikari Club.
Quite gory, very good. A bit rushed, but that makes it an easy read. Characters aren't too deep, though some fall into a gray area.
7.8.10

17 02,2021

Apocalypse No Toride

 9.5(286 voted)
Complete
Author(s): Kuraishi Yuu,Inabe Kazu
Genre(s): Action / Horror / Psychological / Shounen / Supernatural / Tragedy

Our MC got wrongfully accused of murder, and is sent to a juvenile detention center. He ends up in the misfit cell 4, and spends the rest of his time... in an apocalypse?
Really good, I love this author. Not too gory, but creepy, great art, and I love the characters. Definitely recommend.
8.5/10

20 02,2021

Shingeki no Kyojin

 9.8(236 voted)
Complete
Author(s): ISAYAMA Hajime
Genre(s): Action / Drama / Fantasy / Historical / Horror / Mystery / Shounen / Tragedy

Does this really count? Well, we all know the plot, same publishing magazine as "Tomodachi Game". Great characters, I can't bring myself to hate any of them except for a certain edgelord near the end, and great plot, although it kinda went downhill at the climax. Still a good ending, one of the best of all time.
8.6/10

25 02,2021

Hellstar Remina

 8.5(533 voted)
Complete
Author(s): Ito Junji
Genre(s): Horror / Supernatural

A scientist discovers a planet that happened to be born on the same day as his daughter, so he names it "Remina". A short while after, that same planet begins to speed towards Earth, and the people of Earth come to the conclusion that the scientist and his evil daughter are to blame. Remina tries to escape her pursuers, but not without loss.
Pretty cliche characters, and open end with many holes, but very interesting.
7.5/10

25 02,2021

Sea Foam

 9.6(204 voted)
Complete
Author(s): Zen
Genre(s): Drama / Mature / Psychological / Tragedy / One Shot

A collection of tragic and psychological one shots by Zen. I'm not putting all of them, but the links their other works are under 'Photos about the manga" as always. They do a terrific job putting plot twists, and seem to do a lot of mangas about people who are disabled in some way, physically or figuratively. Overall the mangaka gets:
8.2/10

26 02,2021

The Beautiful Ones

 9.3(165 voted)
Complete
Author(s): Tomita Douji
Genre(s): Fantasy / Psychological

The plot is pretty straight forward and short, so I'm not putting a summary. Absolutely stunning. The art is great, but the plot is amazing. Beautiful and sad, it kinda leaves you with an empty feeling.
8.0/10

28 02,2021

Kaibutsu Koroshi

 9.0(561 voted)
Complete
Author(s): Tomita douji
Genre(s): Horror / One Shot / Psychological

A boy and his twin train themselves to escape their hellish life with their father by plotting to kill him.
Same author as "The Beautiful Ones". Very good plot, and quite the twist at the end. Great art as always.
8.1/10

28 02,2021

What can a LIST do?

You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.