Whew. This anime is heavy, dark, scary, and graphic, but if you don't mind those themes too much, it is amazing. Attack on Titan is critically acclaimed for its phenomenal animation, character development, and storyline. In a world where giant human-like monsters called titans roam the Earth and eat humans, 15-year-old Eren Yeager and his friends join the Survey Corps to stop the Titans from destroying their town and their livelihood. This show is so wild I have to watch YouTube videos on the side just to understand what is really going on.
Watch Attack on Titan on Hulu and Netflix.