User blog comment:MiyamaSara/Have to do with the girl on Headmaster picture, Yume, Hime/@comment-29761963-20161106190433

Ok, I think I understand because in the picture is a girl with the S4 uniform. And if you look closely at episode 27 when Laura and Yume do some research on the past S4 members you'll see a girl named Hikami(or something like that) and if you look at this picture closely, the one that is on the Headmaster's desk, you'll see that they look similar.