Ei is a Very popular girl who both students are like by her. She is very beautiful, intelligent, popular,acts cold to every but it's just a mask but it seems everyone still like her 

Even with all of this, Ei has someone she likes for a long time and doesn't know how to express her feelingsshe tends to act like a classic tsundere that is hard to get and doesn't show any affection to one she likes but gets flustered and likes a certain some romantic though she's not sure they feel the same thing