Primary Lecturer Wills is an authority in the Spiritual Evocation division. His father, Sir Trevor, owned the Marburry Workshop that utilizes an entire wasteland to operate as a Magical Workshop. However, the Workshop went out of control, causing many casualties including that of Sir Trevor himself. Lord El-Melloi II, seeking assistance from Spiritual Evocation in order to participate in the Holy Grail War, begrudgingly accepts the request to solve this case. However, what awaited the entourage who arrived at the mansion was Hishiri Adashino, a member of the Policies Department that investigates and enforces rules within the Clock Tower.

An incident occurs where Trisha Fellows is murdered by someone aboard the Rail Zeppelin. Lord El-Melloi II undertakes the investigation for the case, but Olga-Marie has doubts about his way of life as it is far from how a Mage should act. Meanwhile, Shishigou and Luvia, under Reines' orders, are conducting their own investigation. The Mystic Eyes Collection Train begins its procession once again, and a mysterious figure appears before Lord El-Melloi II and Gray. The assailant who descends upon the pair with overwhelming power is the materialization of a Heroic Spirit engraved into human history... A Servant.

Gray and the Servant Hephaestion clash within the Child of Einnashe. However, they are engulfed in an avalanche, inevitably forcing a cease-fire. While they temporarily sheathe their weapons, they speak to each other about their ideologies about the relationship between Masters and Servants. Shishigou and Luvia find out that Trisha was investigating about the serial murders from seven years ago and about the Holy Grail War, and see the link between her and the Rail Zeppelin. As various speculations intertwine, Adashino begins to disclose her own deductions in place of Lord El-Melloi II aboard the Mystic Eyes Collection Train...