The world-renowned private security company 'Telsio'. The three members, Tsukasa, Shinrin, and Yasumin, are skilled bodyguards, but they are actually high school girls. A crisis approaches the three as they protect a mysterious girl――!! A new sensation in girls' action epic, woven by Makoto Fukami of 'PSYCHO-PASS' and the unparalleled artist Sakaki Yoshioka, begins!!