This episode tells the story of the protagonist Subaru Natsuki, who finally succeeded in reaching an alliance agreement with Duke Crusch after going through many hardships, and took the first step to save Emilia! However, the powerful monster in front of Subaru, the White Whale, would never let Subaru go easily. Therefore, under the convening of Subaru and Curio, a group of veterans who had a deep hatred for the White Whale, and the mercenary group "Iron Fang" from the northern countries formed a crusade team and launched an attack on the White Whale! Subaru's duty in this fierce battle was to act as a bait, and what kind of thoughts did Rem accompanying him have?
