Worried about a student who is bad at studying and frequently fails grades, homeroom teacher Yumiko visits his home. However, the student's parents are out, so they end up meeting alone. Taking this rare opportunity, she asks the student if he has any worries that he would be reluctant to tell his parents. The student says that he can't concentrate on his studies because he is constantly having obscene fantasies. As a homeroom teacher, she must help troubled students. With a renewed resolve as a good teacher, Yumiko teaches her student how to kiss like an adult...