Emiya and Rin have paired up in order to defeat Caster and regain their companions, but does Emiya have the strength to face a servant in battle? Can he even face his decision to let Saber be captured? With the help of Rin and an unexpected ally, the team may actually have a chance at winning if luck is on their side. What will it take to turn tides of war to their favor? And just what is their new friend hiding from them ...?