Yuuya Tachibana

A guy who goes to Nishi High in class 1-J. He is considered one of the most handsome boys in the school and has an interest in Chiemi (though no one knows whether its friendly or not). He has apparently been watching her for some time, making up excuses to talk to her. At the end of the chapter that introduces him, it shows him talking with some classmates about a "game" he's playing with her, though it has not yet been revealed what that "game" is.