Lisa Kamijo, an ordinary second-year high school student, gains superhuman strength through a wristband she unexpectedly acquires. Together with Mia Misaki, an agent of the secret organization ISI (Independent Secrecy Inspection) that developed the wristband, she becomes a " champion of justice ," fighting against the ambitions of Audrey Toshogu, the head of the Toshogu Group. However, the situation becomes complicated when Lisa's mother, Yuka Kamijo, is actually Audrey Toshogu's tutor and tries to raise Lisa as her confidante. Furthermore, Lisa and Mia become entangled in a turmoil within the Toshogu Group.