My top 5 horror/psychological anime

In no particular order since I think they all are good in their own way. The descriptions are from MAL. I haven't seen that much horror/psychological anime so this list is going to get an update in the future.

1. Mirai Nikki (Future Diary)
    Episodes: 26 

This psychological thriller, based on the manga written and illustrated by Sakae Esuno, is about Yuki, a loner who's not very good with people. He prefers to write a diary on his cell phone and talk to his imaginary friend, Deus Ex Machina – The God of Time and Space. However, Yuki soon learns that Deus is more than a figment of his imagination when he makes Yuki participate in a battle royale with eleven others. The contestants are given special diaries that can predict the future, each diary possessing unique features that give it both advantages and disadvantages. Within the next 90 days, the contestants must try to survive until there is only one left standing. The winner will become the new God of Time and Space.

2. Another
    Episode: 12

When Kouichi Sakakibara transfers to his new school, he can sense something frightening in the atmosphere of his new class, a secret none of them will talk about. At the center is the beautiful girl Mei Misaki. Kouichi is immediately drawn to her mysterious aura, but then he begins to realize that no one else in the class is aware of her presence.

3. Pshycho- Pass

    Episodes: 22

The series takes place in the near future, when it is possible to instantaneously measure and quantify a person's state of mind and personality. This information is recorded and processed, and the term "Psycho-Pass" refers to a standard used to measure an individual's being. The story centers around the "enforcement officer" Shinya Kougami, who is tasked with managing crime in such a world. In the future, it is possible to quantitatively measure a person's emotions, desires, and every inclination. In this way, it is also possible to measure a person's criminal tendency factor, which is used to judge criminals. This is the story of a team of policemen dedicated to maintaining public order. Some of them work in the Enforcement Division, responsible for the apprehension of criminals, while others belong to the Supervisory Division which oversees their colleagues in Enforcement. 

4. Deadman wonderland 

    Episodes: 12

Ganta is the only survivor after a mysterious man in red slaughters a classroom full of teenagers. He's framed for the carnage, sentenced to die, and locked away in the most twisted prison ever built: Deadman Wonderland. And then it gets worse. At Deadman Wonderland, convicts are forced into brutal deathmatches for the amusement of the masses, the cheers of the crowd drowning out the screams of the dismembered. Even when Ganta befriends Shiro, an unusual female inmate, his dark fate crushes all hope —until he discovers the strange ability to wield his spilled blood as a weapon. Ganta learns his new skill might be related to the murderous man in red and uncovers disturbing secrets that could expose those who stole his freedom. He's determined to see justice served —but first he'll have to fight for his life in a prison that holds a million ways to die. 

4. Btooom!

    Episodes: 12

In the blink of the mind's eye, Ryouta Sakamoto suddenly finds himself transported from playing the hit Btoom! video game to being stranded on a mysterious island, equipped with a day's worth of provisions, a bag of bombs, a strange crystal embedded in his left hand and a huge gaping hole in his memory. But it doesn't take long to figure out what's going on, especially after the first person Ryouta meets tries to kill him. Someone is attempting to recreate the ultra-violent Btoom! game in real life, and the island has been filled with an army of other unwilling players, each armed with one of the multiple variants of explosive weapons called BIM. Fortunately, Ryouta's an ace Btoom! player, but this insane version of the game has no reset switch or second lives, and there's only one way off the island: kill seven other people before they can kill you! Can Ryouta repurpose his game based skills fast enough to survive? 

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KuroKitsune