She was on a date with her boyfriend at the time, at the spot where Rintaro and Kaoruko went for the festival, and boys from Chidori saw them. It got rough when they approached them and she fell off the cliffside, and got injured.
Thank you! I guess I'm too immature to understand how the professor feels the trauma from this event. I'm sorry it makes no sense to me that two schools got so ugly from that... well, thank you for the explanation <3
If I remember correctly it's because that girl told the professor she was going to the festival. She got heavily blamed by the girl's parents who was pulled out of kikyo
The girl had an irrecoverable injury and the teacher felt super super responsible and also realized the boys that did this to her felt no guilt so since then till now she made the kikyo girls hate the guys in the other school to prevent any interaction.
Chidori already had a reputation for having troubled students, and when Matsukasa's father went to the school and held Toki responsible for everything that had happened, how could she, as the teacher, have let it happen? All that responsibility fell on her, and she accepted it. She still feels guilty that not only was Matsukasa hurt, but that she, as the teacher, wasn't up to the task, which, to be honest, wasn't entirely her fault. Matsukasa was a closer and more trusted student, and Toki trusted her judgment, but then Chidori's troubled students arrived, and Matsukasa not only ended up injured, but her father transferred her to another school. All that blame fell on Toki.
Can someone explain what happened to that ex student?