You are Sakuba Kenichi, a private tutor for a high school student named Souki, who you find to be quiet and impolite. As her mother explains, her behavior is a result of an accident that occurred three years ago. At that time a criminal killed her father and wounded Souki. Her grades started to drop tremendously due to locking up in herself. Hopefully, you can break the ice and heal her wound.

[From animedensetsu]