At his home, Shirō tells Rin that he plans on continuing to fight in the Holy Grail War, even without a Servant. She replies that she has no choice but to let him before reaffirming their partnership. While discussing a strategy to defeat Caster and rescue Saber, the two decide to team up with Illyasviel, since Archer had told Rin that Berserker is in fact the ancient Greek hero Heracles, which might give them an advantage against Caster. Meanwhile, Caster recounts the time when she was summoned for the Holy Grail War by another magus, only to be unsatisfied by his inefficient method of acquiring mana for her. After Caster asked that she be allowed to acquire mana herself, the magus realized he could not trust a magic user better than himself. As a result, he contacted Kirei and asked for another Servant, but Kirei told him to dispatch Caster first before making another Master-Servant pact.