Tokyo is flooded with countless heroes — chōjin — during the time of "apotheosis." Their origin stories are all different. While some were altered by evil organizations, others came from space, magical worlds, or are fairies from ancient times or robots. But the Japanese government could not simply close its eyes as these superheroes ran rampant.
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, who are 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 a mysterious alien life form known as MESS.