Household chores at home are extremely boring, so Yuria Satomi suggested to her husband to take extra English classes during her free time, which has been her passion since childhood. However, after getting married, she became busy with family duties and has not been able to fulfill that dream until now. After her husband agreed, Yuria quickly enrolled in a center, and her teacher is a tall, strong black man. Unfortunately, she had always heard that black men are very impressive and fun to be with, but she had yet to experience it herself. Curious about this, she gradually forgot about studying and began spending her days in secret with her black teacher.