The battles between mankind and Kaiju are in the distant past. Now, souls of those giant monsters are manifesting in the young women called "Kaiju Girls." Having become full-fledged members of GIRLS,Agira,Miclas, andWindomare growing into productive members of the organization, with fulfilled lives. But one day, a new breed of Shadows is reported to be causing trouble.
Meanwhile, another member of GIRLS,Alien Guts, is experiencing a strange change...