In this collaboration between U-Dash and FunCity, our protagonist is a female teacher known as "Tetsumask" due to her serious demeanor. She accidentally encounters a exhibitionist woman who corrupts her, leading her down a path of schoolwide nudity and embarrassment. This DVD features nine scenes showcasing her humiliation and sexual pleasure throughout various locations within the school grounds.

「同人サークルU-Dash」×「FunCity」コラボシリーズ！真面目一徹のため生徒から「鉄仮面」とあだ名されている女教師が、偶然遭遇した露出狂女に感化され、校内全裸徘徊にハマってしまい羞恥快感の虜に…教室・体育館・校内徘徊で羞恥快楽に体が疼く全9シーン収録！