You are very strange, Y/n... But... I really like you... Itona... I have never met anyone like you before... Please take care of me... I really care about you... Don't ever leave me, Itona-kun... Y/n is Chifuyu Matsuno's twin sister... Y/n adores her brother very much... But she soon meets Itona Horibe... He is strange... But soon as Y/n understands her mission is to kill this creature called Koro-sensei... She gets along with Itona... Soon Itona gets protective of her... They fall for each other along the way...