Manga Hana-kun to Koisuru Watashi

Nanase Sakashita is good at playing the role of Model Student but that doesn't stop her from taking an interest in Hana-kun, the schools delinquent. Hana-kun accidentally drops a small box while sneaking around on the school grounds. When Nanase tries to return the box, Hana-kun tells her to keep it for its already too late to give it to the person he likes, who is this person?