Yui is a beautiful and serious teacher who is popular with her students. She is an excellent teacher and has been appointed as the head teacher of her grade at a young age. However, she has a problematic student in her class, and no matter how much she warns him, he doesn't listen, which worries her. One day, the problematic student, Tatsuo, stops coming to school. Worried, Yui calls him and he tells her, "I want to talk, so please come to a specified location." The noble, beautiful, kind and righteous female teacher tries to save the bad students, but ends up pinned down and then sexually assaulted by their friends. This thoroughly depicts the masochism that blossoms as a result.