Kazuya transferred to another school because of his parents. Her mother Kei was worried about Kazuya's ability to do well at school, but her worries seemed to be groundless and she soon brought her friend Koji home. Kei liked Koji, who was polite in both literary and military arts, and she gradually allowed her feelings. However, it becomes an enemy. "I wonder if her aunt will be Koji-kun's girlfriend."
