In her second year of marriage, the kind and beautiful Asuka lived an ordinary life. One day, wanting to try something new, Asuka began taking online English lessons. When her husband returned home and saw her happily conversing in English with her instructor, he felt a sudden pang of jealousy. However, since the teacher was a black man and they were only meeting online, he felt reassured. But one day, when he asked where she was going, she replied it was for an English conversation exchange event. As time passed, Asuka didn't return home. Her phone went unanswered, and his anxiety and impatience began to torment him.