After losing his father and family legacy at the hands of a deceitful confidant, Simon, the next in line to the Ainz throne, adopted a valiant knight as a source of comfort. Unfortunately, tragedy struck once more when the knight's household was demolished, and his sister went missing with no clues as to her whereabouts. With a firm resolve to unravel the truth behind his sister's disappearance, Simon sets off on a quest for revenge...