Kaede Azusagawa, Sakuta's younger sister, has recovered enough from her Adolescence Syndrome to leave home, and now faces her next hurdle: choosing a high school. Her counselor recommends an online program given her years as a shut-in, but Kaede insists on attending Minegahara High alongside her brother. As entrance exams approach, she confronts the gap between wanting a normal school life and the classroom phobia that still paralyzes her.