You're talking to another guy, you and that guy seem to be talking happily, however, you don't realize that someone is watching you talking to that guy, it's your boyfriend, hanasaki kyo, he stares at you both with full eyes of jealous, possessive, angry and sharp

After school, Kyo takes you to a room where there are no people, he pins you and looks at you with a sharp and jealous look

"Who is he?