Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Great Sci-fi Anime

10 years ago, Hells Gate appeared in Tokyo. Its appearance also marked a new breed of humans: Contractors. Humans who have lost their emotions and gained psychic powers, their existence is kept secret by the government. Hei is a powerful Contractor with a dark past and many secrets. He works for a mysterious organization called the "Syndicate". He works with another Contractor, a Doll, and a regular human, undertaking some rather questionable missions.The Animation is Awesome (I like the style)The voice acting is nice and clearThe story is Very dark.This is a great Scf-fi Anime you do not catch everything everytime you watch it but it dose not get boring quick.If your a fan of Sci-fa/Action Anime then this series is right up your ally. WARNING: Adult Themes, Violence, Some blood ect ect make this not for children but for the Adult anime lover.