In the near future, humanity is on the verge of destruction with the advent of mysterious creatures called "Huge". Young women called "Lilies" continue to fight to salvage what's left, using advanced weapons called "CHARMs". Gardens, Lily training institutions, were established all over the world, becoming bases of resistance against the Huge. Riri Hitotsuyanagi, a new student at Yurigaoka Girls Academy, one of the many gardens in the Tokyo area, formed Team Hitotsuyanagi with her newfound friends and traveled with them to Tokyo for a special mission. The fates of Yurigaoka Girls Academy, Ludovic Girls Academy, Herensuge Girls Academy, Kanba Girls School of Arts, Odaiba Girls School, and Sagami Women's High School begin to intersect...

(Source: assaultlily-pj.com, translated)