Since she was young, Karen dreamed of becoming a teacher. She worked hard and finally achieved her dream. After a week of internship at a new school, she was assigned to be the homeroom teacher of a class. She tried to memorize the names of her students and called them by nicknames. Karen was very popular among her students, and they all loved her except for Hayato. He frequently skipped school and got into fights with students from other schools. Karen wanted to help him and to get him to open up to her. She often met and talked with Hayato, writing a diary together with him. Gradually, feelings developed between them. Although she knew this was not allowed and could ruin her childhood dream, she loved Hayato! They eloped to date, went to hot springs together, enjoying moments as a couple. I love you. After you graduate, let's get married. A beautiful love story but forbidden, they were separated, but their hearts will always be together.