Yumiko has a secret that must be kept hidden. - Physical relationship with student. - It was such an exciting time for Yumiko that she became obsessed with it, even at the risk of ending her teaching career if it was discovered. - Recently, however, his students have begun to press for a relationship within the school, seeking even more stimulation. - It's too dangerous. - Reason tells us so. - However, Yumiko's desire escalated and she could not suppress her urge to seek thrills...