"Teacher, let me have sex with you at school next time." Yumiko was confused by the unexpected request. While playing the role of a strict female teacher, Yumiko was having a physical relationship with her student behind the scenes, but recently, the Kokoro student has been looking for more excitement. Yumiko refuses, saying that she cannot take the risk of threatening her life as a teacher, but the hot-blooded student does not listen... Yumiko writhes in agony at the sense of immorality of having an affair at school, and all she can do is desperately suppress her voice and endure so as not to be found out.