Sangatsu Usagi mo Otenki Shidai

When Shiori was in Tokyo, she just got her heart broken and now she has to moved from Tokyo to Gunma because of her father's work. There, she meets a boy who seems to be a caring person at first until he realizing who her father is, that is when he starts hurting her feeling intentionally. Shiori thought that this is because she accidentally slapped his face when they first met, but is there something else that motivate him to be cold toward her?