The story takes place in the early summer of 2015 and is set in the city of Tachikawa, Japan. The city is populated by people known as Gatchaman, warriors that fight in special reinforced suits that are powered by the manifestation of spiritual powers of living beings called NOTE. Enter Hajime Ichinose, a 16 year old energetic high school girl who is obsessed with collecting day planners and stationary. She is chosen to become a Gatchaman and tasked with the duty of fighting against a mysterious alien life form known as MESS.
