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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)

Tomodachi Game

 9.6(296 voted)
Ongoing
Author(s): YAMAGUCHI Mikoto,SATOU Yuuki
Genre(s): Shounen / Mystery / Psychological

Not thriller or horror, but a good death game shounen, and IMO, pretty good characters. They're all cliche, but the author plays them off to be one of a kind. Not great but a good binge
8/10

04 02,2021

Signal 100

 8.9(898 voted)
Complete
Author(s): Miyatsuki arata,Kondou shigure
Genre(s): Drama / Horror / Psychological / Supernatural

A class dragged into a death game with 100 signals. Those signals trigger immediate suicide, and can be anything from pinching your nose or saying a name. Very good read, highly recommend. On the gory side, so take note of that. I liked it a lot, the MC was a bit boring, but the plot at the end got me.
8/10

04 02,2021

Jinrou Game

 9.0(126 voted)
Complete
Author(s): Kawakami Ryou,Koudon
Genre(s): Horror / Mystery / Psychological / Seinen / Tragedy

First of the Jinrou Game series.
A girl is dragged into a real-life game of Werewolf (AKA Mafia) She has to survive from the Werewolves while staying clear of suspicion, and keep her mentality in check.
This is reaaaally good. Not too gory, fantastic plot, though the character twists were a bit obvious. Even though the ending was what I had thought it was going to be, it still somehow surprised me.
8.7/10

04 02,2021

Jinrou Game - Beast Side

 9.2(956 voted)
Complete
Author(s): Kawakami Ryou,Koudon
Genre(s): Seinen / Horror / Psychological

Second of the Jinrou Game series.
I won't say anything about the plot since it's connected to the first, but its really good. There wasn't too much character development besides a certain girl, but that development made this one a bit more psychological than the first. Not as good, but still a worthwhile read.
8.5/10

04 02,2021

Jinrou Game: Crazy Fox

 8.7(683 voted)
Complete
Author(s): kawakami ryou,koudon
Genre(s): Seinen / Drama / Horror / Mystery / Psychological / School Life

Third of the Jinrou Game series.
This MC and the story is seperate from the first two, and the game has become even more twisted. The plot is still there, gotten slightly old, but good nonetheless. It's much better than the comments say, but the ending was a bit unsatisfying. Still, just as good as the first and second.
*Make sure to read the first two in order to have an understanding of how the game works. It's the third in the series for a reason
8.3/10

04 02,2021

Pumpkin Night

 9.3(750 voted)
Ongoing
Author(s): Hokazono Masaya,Taniguchi Seima
Genre(s): Action / Drama / Horror / Psychological / Seinen / Tragedy

Now this one sorta scarred me, but it was good. Definitely not one of the best I've read, and it has a ton of gore, but still worth a read. The plot advances a bit too fast for me, and although the characters are good in their own right, not for me.
6.9/10- you should still give it a try though.

04 02,2021

Aku no Kyouten

 8.7(350 voted)
Complete
Author(s): Kishi Yuusuki,Karasuyama Eiji
Genre(s): Horror / Psychological / Seinen

"Hasumin". This is the name a class of students call their beloved teacher. This teacher seems friendly, handsome, outgoing, and smart. He is all those, but so much more than they'd ever expect.
This one started my obsession with psychological mangas, and its really good. The beginning is a bit slow, but reading a bit more, it gets darker and darker, eventually leading to a pretty long, but great climax. Not gory, but definitely dark.
8.7/10

04 02,2021

Tenkuu Shinpan

 9.2(269 voted)
Complete
Author(s): miura tsuina
Genre(s): Action

A teenage girl wakes up on top of a building. Seems like going to the ground is forbidden, while insane murderers in masks are wandering around. She is confused, but makes her way around killers, determined to find her brother, and then get out alive with him.
Shounen-like, and its good. The plot starts out amazing, but it gets a bit hard to read by the end. I liked the MC and her "brother" a lot, and please note the twist at the end. Good characters, fanservice, not gory.
7.4/10

04 02,2021

Judge

 8.3(303 voted)
Complete
Author(s): TONOGAI Yoshiki (Story & Art)
Genre(s): Drama / Horror / Mystery / Seinen

A teenage boy wakes up in a mysterious place. Adjusting to his surroundings, he finds that he is surrounded by mysterious people in masks. Turns out they were dragged there against there will, and along with him, they participate in a death-by-vote game.
This was great. Plot was great, characters were a bit meh, but that ending- Even when you're at the end, it's not going to turn out like you think.
8.1/10

04 02,2021

Dead Company

 8.5(82 voted)
Ongoing
Author(s): Tonogai yoshiki
Genre(s): Adventure / Drama / Horror / Mystery / Psychological / Tragedy

Not too sure how it's going to turn out yet, seeing as there are only 3 chapters, but its about a man who participated in a game similar to the one in "Judge" (they have the same author), and he survived. Even though he went through hell to get out, he's dragged into something sinister yet again.

04 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.