"Rin's sister is
Sakura. Yes, I know it seems odd, but she was handed over to the Matou family at the age of four by her idiot father, and then tortured for eleven years in the most horrific manner. Her only happiness in life is the time she spends with
you. Her grandfather is an evil monster who implanted worms in her to allow him to control her, torture her and even
kill her on a whim", I say, sadly.
"She needs help, Shirou. If she's here like Merlin claims, and in Alter's territory, she'll need to be rescued, before it's too late", I say. "But, it's not that simple. If you come with us, I'll explain everything in more detail, and you can help her when you get home
too".