The story takes place during the fourth Witch War. It is a time of fanatical religious fervor. On the one hand, by the Sacred Office, a powerful organization leading an Inquisition against heresy, in order to purify the sinners who threaten humanity. And on the other hand, those labeled “witches”, responsible for conducting a mysterious ceremony that contradicts the rules of the Church. Set forth with Sisters Semilla and Fran, missionaries in the Church’s service, on their journey to thwart the witches’ ceremony and protect the common-folk from heresy that endangers the status quo.