One year after the Kidojis' eldest son Otohiko was arrested for his part in a terrorist kidnapping, which resulted in multiple deaths, all the other perpetrators' parents have either resigned from their professional positions or taken their own lives, Nobuyuki Kidoji remains adamant that he is not responsible for his son's actions.

To solve the mystery of a murder of an old governess which takes place at a wealthy Daidoji family's country estate, family secrets and lies dating back several generations must be sorted out once and for all.