Ep. 4: Shirou and Saber visit Fujimura while Rin investigates the mana traces at the gas leak site.

After being summoned by Fujimura, Shirou and Saber travel to his school. Shirou struggles to explain Saber’s presence, noting that she cannot dematerialize. Despite his efforts, both Fujimura and Sakura end up staying at Shirou’s residence. Meanwhile, Rin visits the location of a recent gas leak. By analyzing faint mana traces found at the scene, she deduces that Caster is responsible for the incident. This investigation highlights the growing tension and the hidden magical activities occurring within the city, as key characters navigate their complicated living arrangements and uncover clues about their enemy's movements.

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