[-Isotope]

Some of my recommendations for a dark or psychological thriller animes will be:

• Another
  It is arguably one of the best horror anime ever made. The story is gripping and has an eery effect for a couple of episodes.
  
• Higurashi No Nako Koro Ni
  Higurashi is quite a lot popular from other titles in horror genre.
  Though unlike Another it uses heck lotta Gore to create horror. After a couple of arcs, I found the repetition of story kind of funny rather than dark.
  
• Zankyou no Terror
  After binge-watching it a couple of weeks ago, I am glad that I gave this series a go.I'll strongly suggest everyone to watch it.
  
• Aoi bungaku
  I'll just say that it's an anime which is "Dark" af.
  
• Death Parade
  
• Deadman's wonderland
  
• Paranoia Agent
  
• Perfect Blue
  
• Black lagoon
  
• Death parade