What are the three dark animes?

There are many anime series that could be considered "dark", depending on one's interpretation and perspective. However, here are three anime series that are often cited as being particularly dark:

1. Attack on Titan: Set in a world where humanity lives behind walls to protect themselves from giant humanoid creatures called Titans, Attack on Titan explores themes of survival, death, and the dark side of human nature. The anime features intense action scenes, graphic violence, and psychological horror.

2. Death Note: This anime follows a high school student named Light Yagami who discovers a supernatural notebook that can kill anyone whose name is written in it. As he becomes consumed with his newfound power and pursues his twisted version of justice, Death Note explores themes of morality, power, and corruption.

3. Berserk: Based on a manga series of the same name, Berserk is a dark fantasy anime that tells the story of a skilled warrior named Guts who is on a quest for revenge against a former ally who betrayed him. The anime features graphic violence, sexual content, and explores themes of trauma, betrayal, and the consequences of ambition.