Some Time ago a certain dangerous "Accident" had happened. As a result of it, all the members of the Abiiyest family, the only ducal lineage of the Rittash Empire, had lost their memories about this event. But there is a slim chance that their memories will return... That was the story Vaierre Abiyest had told his family members. However, his eldest son Remiere was not satisfied with it. Together with his younger brother Secco and sister Eiessa he decided to solve this mystery.