The brothers discover that their monastery was attacked by a masked man whose objective is to kill Satan's relatives. Yukio tranquilizes Rin to keep him from going after the man, upsetting Shura, who feels the move was unlike him. She motivates Rin to control his flames. Ryuji, Konekomaru and Renzo are held hostage by the masked man and Mephisto is arrested by Arthur for unauthorized biological research. Rin manages to control his flames, saving his friends. The culprit flees, and Shura realizes that it is a woman, who is Neuhaus's wife.