C239
The Blue Elves were just a puppet.
Five years ago, a female student called Xuanyuan Yue had indeed entered the Blue Elf's class. Later on, this female student had suddenly committed suicide one day. Although suicide didn't work, she had left the School from then on and had never heard of any news regarding Xuanyuan Yue.
As for who Xuanyuan Yue was, the matter of the suicide