Um adolescente luta contra um ataque de parasitas do espaço com a ajuda de Migi, uma criatura parasita dócil que vive em sua mão direita.

From Wikipedia: Active Raid takes place in the near future with advanced technology, particularly a system known as ACTIVE (Armored Combined Tactical Intelligence Vanguard Elements). Due to the abundance of serious crime around the world, police forces begin to use ACTIVE technology along with powered armor mobile suits known as Will Wears. The series focuses on one such police unit in Japan known as Unit 8.

Follows the life of Eijun Sawamura, a gifted baseball player who have his own extraordinary pitcher's talent. His goal is one, to become the ace of Seidou High School.