狭間 エリ

She is a lady who assists the headmaster Nijou as vice principal and head sister at Jingu Gakuen. She has a motherly personality with a good sense of humor and civility, and is very attentive to her students. She is loved by many students at the school as "Eri-sensei" She is deeply concerned about the students and faculty members who are suffering physically and mentally due to the effects of the Dark Hour. She is a presence who, along with Nijou, sometimes uses her body to provide thorough support for the main character's mission. She is able to use magic, though not as well as Nijou.