It has been years since the battle between the human race and the monsters has ended, and a new era of peace has started. In the present day, girls who contain the souls of past monsters have appeared and possess the ability to summon their inner monster forms, called Kaiju Girls. An organization called GIRLS has formed to collect them. The story focuses on the GIRLS rookie members, Agira, Miclas and Windom in their misadventures.
