Once Shirou, Saber and Rin return to Shirou's home, they all decide to avenge Archer and stop Gilgamesh by destroying the Holy Grail once and for all. Through the use of familiar spirits, Rin deduces that the Holy Grail is being summoned at Ryuudou Temple. She then explains that Shinji, the only other mage participating in the Holy Grail War, would be the only viable candidate as a substitute vessel, as it was apparent that Illya was supposed to turn into the Lesser Grail at the end of the war. While devising a strategy to defeat Gilgamesh, Rin realizes that Archer was the only one able to perfectly counter Gilgamesh, since Archer had the ability to summon a duplicate of any kind of weapon. She concludes that Shirou needs to master Unlimited Blade Works so he too can match up against Gilgamesh. Since he does not have the sufficient mana to do so, Rin improvises by performing a ritual that implants her Magic Crest from her left arm into Shirou, thus allowing them to share their mana storage. During the ritual, Shirou inadvertently taps into Rin's memories, including one where Rin once saw Shirou practicing the high jump and fell in love with him, which embarrasses her. Afterwards, Shirou finds Saber exploring his house, and she thanks him for showing her the way to her dream. She has him promise that he and Rin will survive the Holy Grail War. Meanwhile, Gilgamesh finishes transporting Shinji to Ryuudou Temple and summons the Holy Grail.