Yuri Koigakubo

As the twenty-nine-year-old homeroom teacher for Ryūji’s class, this educator prioritizes her students' academic success and well-being, even banning Haruta from holiday festivities to ensure exam preparation. While she initially maintains a relaxed, timid demeanor, her anxiety regarding her single status grows as she approaches thirty. This pressure to marry leads her to dress more formally, but failing to find a partner eventually plunges her into a more cynical, depressed state of mind.