A 19-year-old prep school student named Riko, unable to suppress her urge for exposure, innocently reveals her feelings during a job interview. Though she normally dedicates herself to exam preparation, one month ago, a shocking encounter awakened her to the new pleasure of public exposure. Unable to forget that intense experience, she tried it several times with her boyfriend, but the thrill she felt—being in her underwear in an elevator or going outside after taking diuretics—was different from what she truly craved. Now, she seeks something even more.