Seira Yonekura works as a private detective by day and fights evil as a superheroine by night. One day, she witnesses students from Ijuin Muscle School—where troubled youths are rehabilitated through intense workouts—being kidnapped by the evil secret organization Un-Crime. After rescuing the students, Seira receives a new request: to find her missing allies. To ensure the students' safety, she goes undercover as a special guest instructor while investigating the disappearances. However, school director Maya Ijuin and disciplinary trainer Muscle Kohara aim to tame the superheroine, initiating a special lecture in front of the students that exposes her true identity. Moved by Maya's educational philosophy, Seira willingly offers her body for the cause, but as the students' curiosity turns invasive, she gradually loses control... [BAD END]