Rin Tohsaka and Saber, initially enemies in the Holy Grail War, quickly develop a close friendship. They align on war strategies and Rin, despite her teasing, shares Saber's concern for Shirou. In the Unlimited Blade Works narrative, Rin becomes Saber's Master to save Shirou. Post-war, Saber becomes Rin's familiar, and they cohabitate with Shirou.