Shishido Yui

Yui is an English teacher at Kisaragi Academy and the former homeroom teacher of the class 2-9. She is the one who invited her former students to the class reunion. Yui is especially close with her students, and has kept in touch with many of them even after graduation. While she feels it's not her place to pry, Yui can't help but worry that something bad happened to her students and feels responsible for lifting their moods.