1. Death Note - This anime follows a high school student who discovers a supernatural notebook that allows him to kill anyone whose name he writes in it. The series explores themes of morality, justice, and power.
2. Psycho-Pass - In a dystopian future, society is controlled by a system that measures people's mental states and assigns them a "crime coefficient." The series examines issues of free will, individuality, and societal control.
3. Neon Genesis Evangelion - This classic anime explores the psychological trauma of teenage pilots who must fight against monstrous beings known as Angels. The series delves into themes of depression, anxiety, and identity.
4. Paranoia Agent - This anime follows the investigation of a mysterious attacker known as "Lil' Slugger," who seems to be able to bring people's deepest fears to life. The series explores themes of paranoia, anxiety, and the power of imagination.
5. Monster - This anime follows a doctor who becomes embroiled in a conspiracy involving a serial killer he once saved. The series examines themes of morality, guilt, and the nature of evil.
6. Paprika - In this film, a scientist creates a device that allows people to enter and explore their own dreams. The movie explores themes of identity, consciousness, and the power of the subconscious mind.
7. Perfect Blue - This film follows a pop singer who begins to lose her grip on reality after leaving her group to pursue acting. The movie examines themes of identity, obsession, and the pressures of fame.
8. Welcome to the NHK - This anime follows a young man who becomes a recluse and believes that a conspiracy known as the "NHK" is responsible for his problems. The series examines themes of social anxiety, addiction, and the search for meaning in life.
9. Serial Experiments Lain - This anime follows a young girl who becomes obsessed with the internet and begins to blur the lines between reality and virtual reality. The series explores themes of identity, consciousness, and the nature of reality.
10. Ergo Proxy - In a post-apocalyptic world, a detective investigates a series of murders that may be connected to an artificial intelligence known as the "Proxy." The series examines themes of identity, free will, and the relationship between humans and technology.
11. Ghost in the Shell - This classic anime follows a cyborg police officer who must stop a hacker known as the "Puppet Master" from taking control of people's minds. The series explores themes of identity, consciousness, and the ethics of artificial intelligence.
12. Steins;Gate - This anime follows a group of friends who discover a way to send messages back in time, leading to unintended consequences. The series examines themes of causality, free will, and the nature of time.
13. Welcome to the Ballroom - This anime follows a young boy who discovers a passion for ballroom dancing and must overcome his social anxiety to succeed. The series explores themes of self-confidence, perseverance, and the power of passion.
14. Haibane Renmei - This anime follows a group of angel-like beings who live in a mysterious town and must come to terms with their past lives. The series examines themes of identity, redemption, and the search for meaning in life.
15. Kino's Journey - This anime follows a traveler named Kino who visits different countries and encounters various cultures and societies. The series examines themes of morality, cultural relativism, and the nature of humanity.
In conclusion, these 15 anime really keep you in suspense throughout the entire viewing, you worry, worry, sometimes even fear for the main characters. Fans of this genre should definitely like it.